Laytime Calculation Disputes
Laytime Calculation Disputes in Maritime Law (With Case Laws)
1. Introduction
Laytime calculation disputes arise in charterparty contracts when parties disagree over the computation of time allowed for loading and discharging cargo. Laytime determines when demurrage (compensation payable by charterers for delay) or despatch (reward for early completion) becomes payable.
These disputes are common in voyage charterparties and frequently resolved through arbitration (especially under LMAA terms) or litigation before courts such as the English Commercial Court.
2. Meaning of Laytime
Laytime is the period contractually agreed for the charterer to load and/or discharge cargo without incurring additional liability.
If laytime is exceeded → Demurrage becomes payable.
If laytime is saved → Despatch may be payable.
Laytime calculation disputes typically involve interpretation of:
- Commencement of laytime
- Valid Notice of Readiness (NOR)
- Exceptions (weather, strikes, breakdown)
- Interruptions
- “Weather Working Days” (WWD)
- “SHEX”, “SHINC”, “Reversible Laytime” clauses
3. Major Areas of Laytime Calculation Disputes
(A) When Does Laytime Commence?
Laytime usually begins after:
- The vessel becomes an “arrived ship”
- A valid Notice of Readiness (NOR) is tendered
- Any agreed notice period expires
Case Law 1: The Johanna Oldendorff
Principle: Defined when a vessel becomes an “arrived ship.”
The House of Lords held that a vessel must reach a position within the port where she is at the immediate and effective disposition of the charterer.
This case is foundational in port charter laytime disputes.
(B) Validity of Notice of Readiness (NOR)
A frequent dispute concerns whether the NOR was validly tendered.
Case Law 2: The Mexico I
The court held that if a vessel is not physically and legally ready to load/discharge, the NOR is invalid, and laytime does not commence.
Case Law 3: The Happy Day
Even if the NOR was invalid, laytime may begin if the charterer proceeds with cargo operations without protest.
This case introduced the doctrine of waiver in laytime disputes.
(C) Weather Working Days (WWD) Disputes
“Weather Working Days” exclude time lost due to bad weather preventing cargo operations.
Case Law 4: The Vorras
The court clarified that bad weather must actually prevent cargo operations to exclude time — hypothetical prevention is insufficient.
(D) Interruptions and Exceptions
Disputes often arise where loading is interrupted due to strikes, breakdowns, or port congestion.
Case Law 5: The Darrah
Held that where a strike exception clause applies, time lost due to strikes may be excluded from laytime if properly drafted.
(E) Once on Demurrage, Always on Demurrage
A core doctrine in laytime law.
Case Law 6: The Bonde
The court reaffirmed the principle: once the vessel is on demurrage, exceptions no longer interrupt time unless clearly stated.
(F) Reversible Laytime Disputes
Where laytime for loading and discharge can be combined.
Case Law 7: The Kyzikos
Although primarily about force majeure, it clarified principles regarding construction of laytime and exceptions in charterparties.
4. Common Legal Issues in Laytime Calculations
1. Port vs. Berth Charter
- In port charters, vessel must be an “arrived ship” at the port.
- In berth charters, vessel must reach the specific berth.
2. Free Pratique & Customs Clearance
If clearance is required before readiness, laytime does not begin until obtained.
3. Congestion
Under port charters, congestion outside port limits may delay arrival status.
4. Calculating Excluded Periods
- Sundays & Holidays Excepted (SHEX)
- Saturdays, Sundays & Holidays Included (SHINC)
- Strike clauses
- Ice clauses
5. Burden of Proof
- Owner must prove laytime expired.
- Charterer must prove applicability of exceptions.
5. Arbitration Perspective
Most laytime disputes are resolved under:
- LMAA Arbitration
- GAFTA/FOSFA Arbitration (grain trade)
- ICC Arbitration (large commodity contracts)
Arbitrators typically rely heavily on:
- Statement of Facts (SOF)
- Time sheets
- Port logs
- Weather reports
- Charterparty wording
Laytime disputes are fact-sensitive and heavily dependent on documentary evidence.
6. Calculation Example (Illustrative)
If charterparty allows:
- 5 Weather Working Days
- Vessel arrives 1 June
- NOR valid at 0800 hrs
- Loading starts 2 June 0800 hrs
- Bad weather prevents loading for 24 hours
Then:
- Laytime counts from 2 June 0800 hrs
- 24 hours excluded
- Laytime expires 7 June 0800 hrs (subject to exclusions)
If completion is on 9 June → 2 days demurrage payable.
7. Conclusion
Laytime calculation disputes revolve around:
- Interpretation of charterparty clauses
- Validity of NOR
- Arrival status
- Exceptions and interruptions
- Weather exclusions
- Application of the “once on demurrage, always on demurrage” rule
Leading authorities such as The Johanna Oldendorff, The Mexico I, The Happy Day, and The Bonde continue to guide arbitral tribunals and courts globally.
Because laytime clauses are highly technical, precise drafting and accurate record-keeping are critical in avoiding disputes.
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