Disruption of Laytime Explained: Interruptions, Exceptions, Weather, Strikes, and Demurrage

Disruption of Laytime

In voyage chartering, laytime is the agreed period during which the charterer may load or discharge cargo without paying additional compensation to the shipowner. Once laytime has validly started, the ordinary rule is that it continues to run until cargo operations are completed, unless the charterparty clearly provides that particular periods are to be excluded, suspended, or treated differently.

Disruption of laytime therefore refers to circumstances that stop, suspend, reduce, or prevent the running of laytime after the laytime clock has begun, or that affect whether a period can be counted in the laytime calculation. These disruptions may arise from weather, weekends, holidays, strikes, congestion, cargo-handling breakdowns, shifting between berths, port restrictions, documentation problems, or the fault of one of the contracting parties.

The commercial importance of laytime disruption is substantial. If a period counts as laytime, it may push the charterer closer to demurrage. If the period is properly excluded, the charterer may avoid or reduce demurrage liability. For shipowners, the same issue determines whether the ship is earning demurrage or whether valuable time is being lost without compensation. For this reason, disputes over laytime interruptions and exceptions remain among the most common disputes in dry bulk, tanker, and commodity shipping.

Laytime Interruptions and Exceptions

Laytime provisions must be read carefully because not every delay has the same legal effect. A period may be outside the definition of laytime altogether, or it may fall within the definition of laytime but be removed by an express exception. This distinction is important in practice because the party relying on the clause must show that the wording covers the period being deducted.

An interruption to laytime usually occurs where the laytime clause itself defines the permitted time in a way that excludes certain periods. For example, if the charterparty provides for Weather Working Days, then periods during which weather prevents cargo work are not laytime in the first place. Similarly, if the charterparty uses a term such as SHEX, Sundays and holidays are excluded because they fall outside the agreed laytime definition.

An exception to laytime, by contrast, usually concerns a period that would otherwise count as laytime but is taken out by a separate exceptions clause. Examples include strike clauses, ice clauses, breakdown clauses, or specific clauses excluding time lost through named causes. In these cases, the charterer normally has to prove that the named event caused the delay to cargo operations. The wording is interpreted strictly, and a broad commercial inconvenience will not usually be enough unless the clause clearly covers it.

This distinction can produce different results. If a ship is waiting at anchorage under a charterparty based on Weather Working Days, bad weather that would have prevented cargo work at the berth may interrupt laytime even though the ship is not yet alongside. However, if the charterparty merely excludes “time lost due to bad weather,” the charterer may need to prove that the weather actually caused a loss of cargo-working time. The exact wording of the charterparty is therefore decisive.

Weekends, Holidays, SHEX, SHINC, and Unless Used Clauses

Weekends and holidays are among the most familiar interruptions to laytime. Their effect depends entirely on the abbreviations and wording used in the charterparty. A clause stating SHEX means Sundays and Holidays Excepted, so Sundays and holidays do not count as laytime. A clause stating SHINC means Sundays and Holidays Included, so those days count in the ordinary way.

More complicated wording appears when the charterparty includes “unless used” language. Under SHEXUU, Sundays and holidays are excepted unless actually used for cargo operations. If cargo is worked during the excepted period, the time used may count. Under wording such as SHEXEIU, Sundays and holidays are excepted even if used, meaning that cargo work may be performed without the time counting as laytime.

Local custom also matters. Sunday is treated as the usual weekly holiday in many jurisdictions, but this is not universal. In some Islamic countries the weekly rest day may be Friday, while in Israel it may be Saturday. Public holidays may also depend on local law, port practice, religious observance, or official declarations. For accurate laytime calculation, the Statement of Facts, port working calendar, local regulations, and agency reports should all be checked carefully.

Adverse Weather and Weather Working Days

Bad weather is one of the most common causes of laytime disruption. Rain, snow, strong wind, swell, heavy seas, unsafe surf, lightning, or other adverse conditions may stop cargo operations, especially where the cargo is moisture-sensitive or where port safety rules prevent work. Weather clauses are therefore central to many dry cargo charterparties.

The phrase Weather Working Day does not simply mean that the weather was unpleasant. The weather must be of a kind that prevents or would prevent the relevant cargo operation. A rain shower may prevent loading grain, rice, sugar, steel products, cement, or fertilizer, but it may have no practical effect on the discharge of certain non-sensitive bulk cargoes. Likewise, wind conditions that stop crane work for one ship or cargo may not necessarily stop operations for another ship at the same port.

Where a ship is waiting for a berth, weather may still matter if the charterparty wording permits deduction of weather periods that would have prevented cargo operations had the ship already been at berth. However, if the clause is drafted as an exception for “time lost” due to weather, the charterer may have to demonstrate a causal link between the weather and the loss of time. The distinction between an interruption and an exception is therefore especially important in weather disputes.

The Statement of Facts (SOF) is usually the starting point for weather evidence. It may record rain periods, wind force, swell, stoppages, and working times. However, the SOF is not conclusive unless the charterparty says so. Weather station records, terminal logs, crane stoppage reports, port authority notices, photographs, and independent weather data may all become relevant if the SOF is disputed. If the agent is appointed by one party and the other party is concerned about impartiality, appointing a protective agent may help preserve reliable evidence.

Breakdown of Cargo-Handling Equipment

Breakdown of cargo-handling equipment can interrupt laytime, but responsibility depends on which equipment failed and what the charterparty says. If the ship is required to use her own cranes, grabs, pumps, or other gear, and that gear breaks down due to a matter for which the shipowner is responsible, the time lost will commonly be excluded from laytime or demurrage. In such a case, the ship was not continuously available for the charterer’s cargo operations.

If shore equipment breaks down, the position is different. Shore cranes, conveyor belts, loaders, unloaders, shore pumps, pipelines, weighbridges, or terminal systems are often within the charterer’s or terminal’s operational sphere, but the legal result depends on the clause. Some charterparties expressly exclude time lost due to breakdown of shore machinery beyond the charterer’s control. Others do not. Without clear wording, a charterer may be unable to deduct the period merely because the terminal suffered operational difficulties.

It is also necessary to distinguish between a true mechanical breakdown and complete destruction or damage caused by another event. English law has treated exception clauses strictly. If a clause refers to “mechanical breakdown,” it may not automatically cover machinery destroyed by fire, collision, explosion, or structural collapse unless the wording is wide enough. A party seeking to rely on such an exception should not assume that a non-functioning machine is always a mechanical breakdown for laytime purposes.

Shifting Between Anchorage, Berths, and Loading Places

Shifting time is another frequent source of laytime disputes. If a ship is waiting at anchorage and later shifts into the first loading or discharging berth, the time spent shifting from anchorage to berth may not count as laytime, depending on the charterparty. In many cases, the ship is still moving into the place where cargo operations can begin.

If the ship has already begun cargo operations and must shift from one berth to another to continue loading or discharging, the time may be treated differently. Where shifting is required by the charterer, or where the charterer has nominated multiple berths, the charterparty may provide that shifting time and shifting expenses fall on the charterer. If the shifting is ordered by the harbour master or port authority, the result will depend on the charterparty wording and the reason for the order.

Some standard forms contain specific language. The ASBATANKVOY safe berth and shifting provisions, for example, give charterers rights to shift the ship between safe berths but allocate specified costs and provide rules for whether shifting time counts as used laytime. In dry bulk chartering, parties should avoid relying on assumption and should state clearly whether shifting time counts, who pays tug and pilot costs, and whether additional port charges are for owners’ or charterers’ account.

Strikes, Labour Stoppages, and Industrial Action

Strikes and labour disruptions can create serious laytime and demurrage exposure. Charterparties often include strike clauses excluding time lost due to strikes, lockouts, labour stoppages, civil commotion, or similar events. However, the mere existence of a strike somewhere in the supply chain does not automatically stop laytime. The clause must cover the event, the event must affect the relevant cargo operation, and any notice or procedural requirements must be followed.

Strike clauses may also cover the after-effects of a strike if the wording is sufficiently broad. For example, congestion caused by a strike may continue after the strike itself has ended. Whether that congestion is excluded depends on whether the clause covers delays caused by the strike and its consequences. Courts and arbitrators will examine the precise wording, the commercial context, and the causal link between the strike and the delay.

Parties should be especially careful when the ship is already on demurrage. The traditional rule is often summarized as “once on demurrage, always on demurrage”, meaning that exceptions protecting charterers during laytime do not automatically apply after laytime has expired. If charterers want a strike, weather, breakdown, or force majeure exception to reduce or suspend demurrage, the clause must say so clearly.

Port Congestion and Berth Unavailability

Port congestion is not always a laytime interruption. In many port charterparties, if a valid Notice of Readiness has been tendered and the charterparty permits laytime to start while the ship waits for a berth, the risk of ordinary congestion may fall on the charterer. Wording such as WIBON (Whether in Berth or Not), WIPON (Whether in Port or Not), or “time to count whether in berth or not” may shift congestion risk toward charterers.

However, congestion linked to an excepted event may create a different result. If the berth is unavailable because of a strike, terminal breakdown, accident, obstruction, or government restriction, the charterer may argue that a specific exception clause excludes the waiting time. Whether that argument succeeds depends on the wording and on proof that the named exception caused the delay. A general statement that the port was congested will usually be insufficient if the charterer relies on a specific exception.

For shipowners, the key is to ensure that Notice of Readiness is validly tendered and that the ship is an arrived ship under the charterparty. For charterers, the key is to identify whether the congestion is ordinary congestion, which may be their risk, or congestion caused by an expressly excepted event. In either case, contemporaneous records are essential.

General Exception Clauses and Their Effect on Laytime

General exception clauses do not automatically apply to laytime or demurrage. A charterparty may contain broad language excusing parties from liability for events such as force majeure, restraint of princes, perils of the sea, strikes, riots, or breakdowns. However, unless the clause clearly applies to laytime or demurrage, English law will not usually treat it as suspending the laytime clock or reducing demurrage.

Specific laytime and demurrage provisions normally prevail over broad general wording. If a charterparty contains a detailed laytime clause and a separate general exceptions clause, the safer interpretation is that the detailed laytime wording governs the calculation of laytime. A party seeking to rely on a general clause must show clear contractual language or necessary implication that the clause was intended to affect laytime or demurrage.

This strict approach reflects the commercial nature of laytime. Laytime and demurrage clauses allocate the financial risk of delay. If a party wishes to change that allocation, the charterparty should do so expressly. Ambiguous exception wording is unlikely to protect the party relying on it.

Fault of the Shipowner and Suspension of Laytime

Laytime or demurrage may be suspended where the delay is caused by the fault of the shipowner. This does not mean that every inconvenience linked to the shipowner stops the clock. The fault must be legally relevant, and it must be a real cause of the delay during the period for which the charterer seeks deduction.

Examples may include delay caused by defective ship gear where the ship is responsible for cargo operations, negligent grounding by the crew, unnecessary ballasting or deballasting carried out for the shipowner’s convenience, failure to keep the ship physically ready for cargo operations, or failure to provide required documentation where the owner is responsible for doing so. If the shipowner voluntarily prevents the ship from being continuously available for cargo operations, laytime may not run during the relevant period.

However, the charterer must usually show more than inconvenience. There must be a breach of an obligation or a matter within the shipowner’s responsibility, the delay must result from that matter, and the shipowner’s fault must be the effective cause of the time lost. Consequential delay may not always be deductible as laytime, although it may support a separate damages claim if the charterer can establish breach and loss.

Can Shipowner Fault Be Excluded?

Parties can attempt to exclude or limit the effect of shipowner fault, but clear words are required. General wording protecting owners from liability for negligence of the master or crew, or clauses incorporating carriage regimes, may not be enough to preserve laytime or demurrage where the owner’s own breach has prevented cargo operations.

If shipowners want protection even where delay is linked to matters on the ship side, the charterparty should state that intention directly. Similarly, if charterers want laytime or demurrage to be suspended for owner-related delay, the clause should be drafted with equal clarity. In laytime disputes, broad language is risky. Specific drafting reduces uncertainty.

Force Majeure, Frustration, and Port Disruption

Port disruption may be caused by strikes, civil unrest, natural disasters, fire, government action, closure of a terminal, cyber incidents, epidemics, or supply-chain failures. Commercial parties sometimes describe these events as force majeure, but under English law force majeure is not a free-standing doctrine. It only applies if the charterparty contains a force majeure clause and the event falls within that clause.

Frustration is also a narrow doctrine. A charterparty is not frustrated merely because performance becomes more expensive, inconvenient, or delayed. The event must make performance impossible, illegal, or radically different from what the parties agreed. Most port delays, strikes, and terminal disruptions will not frustrate a voyage charterparty unless the delay is extreme in relation to the charter and destroys the commercial purpose of the contract.

Therefore, parties facing disruption should first examine the charterparty. They should identify the applicable laytime wording, any strike or breakdown clause, any force majeure clause, any deviation clause, any safe port or reachable-on-arrival provision, and whether the ship is already on demurrage. The answer will usually be contractual rather than general.

Exceptions to Laytime After the Ship Is on Demurrage

Once laytime has expired and the ship is on demurrage, the position becomes stricter. Demurrage is usually treated as agreed compensation for detention beyond the allowed laytime. Ordinary laytime exceptions do not automatically continue to apply after demurrage begins. If charterers want protection during demurrage, the charterparty must say that the relevant exception applies to “laytime and time on demurrage” or use similarly clear wording.

This is a common drafting trap. A clause may state that time lost due to bad weather, strikes, or shore breakdown shall not count as laytime. That wording may help before demurrage begins, but it may not help once the ship is already on demurrage. For charterers, the distinction can be costly. For shipowners, it may preserve the demurrage claim even during a later disruption.

Evidence Required for Laytime Disruption Claims

Successful laytime calculations depend on accurate evidence. The most important document is usually the Statement of Facts, but it should be supported by other records where necessary. These may include the port log, terminal reports, weather records, crane stoppage sheets, notices from port authorities, strike notices, berth line-up records, agents’ messages, emails, photographs, survey reports, and the ship’s deck log.

The Master should ensure that stoppages are recorded precisely, including the start time, end time, cause of stoppage, whether cargo work was actually prevented, whether other berths or equipment were available, and whether the event affected all ships or only the subject ship. Where weather is involved, the record should identify whether the weather prevented cargo work for the specific cargo being handled. General descriptions such as “bad weather” or “no work” are often insufficient.

Charterers should also preserve evidence if they intend to deduct time. They should obtain terminal explanations, official notices, labour union statements, equipment breakdown reports, and cargo readiness evidence. The party relying on an interruption or exception normally bears the burden of showing that the deduction is permitted under the charterparty.

Practical Examples of Laytime Disruption

If a grain ship is at berth and rain begins during loading, the rain period may be excluded under a Weather Working Day clause because the cargo cannot safely be worked. If the same rain occurs while discharging coal and operations continue safely, the period may count.

If the ship’s crane fails and the charterparty requires the ship to provide working gear, time lost through the breakdown may be for the owner’s account. If a shore conveyor fails and the charterparty contains a clear shore breakdown exception, the charterer may be able to deduct the time. If there is no such clause, the time may continue to count.

If a national strike blocks truck access to a terminal and causes a berth queue, a strike clause may protect charterers if it is wide enough to cover the delay and its after-effects. If the clause only refers narrowly to strikes preventing actual cargo work at the berth, the result may be different.

If a ship shifts from anchorage to the first berth, shifting time may be excluded depending on the charterparty. If the ship shifts from one nominated berth to another at charterers’ request, the time and cost may fall on charterers if the charterparty so provides.

Turn Time in Dry Cargo Chartering

Turn Time (TT) is sometimes used commercially to describe the full operational cycle of a ship or shipment, including arrival, waiting, berthing, loading, sailing, discharging, and related delays. In dry cargo chartering, turn time is important because it affects scheduling, tonnage availability, freight economics, and future fixtures.

Although turn time is not the same as laytime, the two concepts are connected. Efficient loading and discharging reduce turn time, while delays caused by weather, berth congestion, strikes, equipment failure, or documentation problems increase it. For shipowners, longer turn time may reduce earning capacity. For charterers, poor turn time may affect cargo commitments, sales contracts, and supply-chain planning.

Conditions for Laytime to Commence

Before laytime can be disrupted, it must first have started. In most voyage charterparties, three conditions are usually required. First, the ship must have arrived at the contractual destination. Secondly, the ship must be ready in all material respects to load or discharge. Thirdly, where required, a valid Notice of Readiness (NOR) must be tendered in accordance with the charterparty.

Arrival depends on whether the charterparty is a berth charter or a port charter. Under a berth charter, the ship normally becomes arrived only when she reaches the named berth. Under a port charter, the ship may become arrived when she reaches the port and is at the immediate and effective disposition of the charterer, provided the charterparty and port limits requirements are satisfied. Clauses such as WIBON, WIPON, reachable on arrival, and always accessible may alter the standard risk allocation.

Readiness requires both physical and legal readiness. Holds must be clean and suitable, gear must be operational if the ship is to provide gear, documents must be in order, and the ship must be able to commence cargo operations. If the ship is not ready, the NOR may be invalid, and laytime may not begin. A premature NOR may not be cured unless the charterparty contains wording that allows later validation.

Drafting Laytime Interruption and Exception Clauses

Because laytime disputes are driven by wording, drafting should be precise. Parties should state whether the clause applies to laytime only or also to time on demurrage. They should identify whether the clause applies while the ship is waiting for a berth, only while alongside, or both. They should also specify whether time is excluded only when cargo operations are actually prevented, or whether the event is enough by itself.

Weather clauses should identify whether the agreed time is Weather Working Days, working days weather permitting, or a fixed number of running hours subject to weather exclusions. Strike clauses should state whether they cover direct strike delay, after-effects of strikes, congestion caused by strikes, and whether partial working affects the deduction. Breakdown clauses should distinguish ship gear from shore gear and mechanical breakdown from wider terminal disruption.

For both shipowners and charterers, the best protection is clear drafting, accurate records, and immediate reservation of rights when a disruption occurs. Ambiguous clauses increase the risk of arbitration, delayed settlement, and unexpected demurrage exposure.

Conclusion

Disruption of laytime is not simply a practical delay issue. It is a contractual and evidential issue that determines who pays for lost time. Weather, weekends, holidays, strikes, port congestion, berth shifting, equipment breakdowns, force majeure events, and shipowner fault may all affect the laytime calculation, but only if the charterparty wording and supporting evidence justify the deduction.

The central questions are always the same: has laytime started, what does the charterparty say, did the event fall within the laytime definition or an exceptions clause, did the event actually cause the delay, and does the clause apply after demurrage has begun? Careful answers to these questions allow shipowners and charterers to manage delay risk, calculate demurrage accurately, and reduce disputes in voyage chartering.