What Laytime and Demurrage Actually Mean
Laytime is the amount of time a charter party allows for loading or discharging cargo at a port, agreed in advance as part of the charter agreement — expressed either as a fixed number of days and hours, or calculated using a formula based on cargo quantity and an agreed loading/discharging rate. Demurrage is the compensation owed to the shipowner when the vessel is held at port beyond that agreed laytime, typically charged as a daily rate specified in the charter party. Its counterpart, despatch, is a reward paid to the charterer when cargo operations finish faster than the allowed laytime, at a rate usually set at half the demurrage rate.
These are commercial, contractual concepts defined in the charter party itself — but whether laytime actually started on time, how much of it was genuinely used, and whether any interruptions counted against it, is determined almost entirely by port-level documentation, not by the contract wording alone. This is precisely where ship agency work becomes financially consequential, not merely administrative.
How Laytime Calculation Actually Works
Laytime typically begins running after the Notice of Readiness (NOR) is validly tendered and accepted, subject to any additional conditions the charter party specifies (such as a set number of hours after tendering before laytime formally commences — commonly referred to as "turn time"). From that point, laytime is calculated based on the actual time used for cargo operations, with specific interruptions (such as weather delays, in a "weather working day" clause) typically excluded from the count, depending on the exact charter party terms.
The Statement of Facts (SOF), compiled chronologically during the port call, is the actual documentary record used to perform this laytime calculation after the fact — recording exactly when NOR was tendered, when cargo operations started and stopped, and the specific reason for every interruption along the way. Without an accurate, detailed SOF, calculating laytime used — and therefore whether demurrage or despatch is owed, and how much — becomes a matter of dispute rather than a straightforward calculation.
Why NOR Tendering Accuracy Matters So Much
The Notice of Readiness must be tendered at the correct time, in the correct manner specified by the charter party, and only once the vessel is genuinely ready in all respects — arrived at the correct location, and with holds or tanks actually prepared to receive or discharge cargo. An agent who tenders NOR prematurely, incorrectly, or without proper acknowledgment from the receiving party can create a genuine dispute over exactly when laytime began, with real financial consequences for whoever bears the resulting uncertainty.
Equally, an agent who fails to tender NOR promptly once the vessel is genuinely ready effectively costs the shipowner laytime they were contractually entitled to start using — a delay that, multiplied by a daily demurrage rate that can run into many thousands of dollars, is a meaningful, avoidable financial loss traceable directly to agency performance rather than to any genuine operational circumstance.
Why the Statement of Facts Is Where Disputes Actually Get Won or Lost
In practice, demurrage disputes are rarely about disagreement over the charter party's laytime terms themselves — they are almost always about disagreement over what the Statement of Facts actually shows happened during the port call. A vague, incomplete, or inconsistently timestamped SOF gives both sides room to argue about exactly when a delay started, how long it lasted, and whether it should count against laytime.
A detailed, precisely timestamped SOF — recording not just start and stop times but the specific reason for every stoppage, ideally with both parties' signatures or acknowledgment at each stage — is what actually allows a laytime calculation to be settled cleanly, without an expensive, time-consuming dispute process. This level of documentation discipline is a direct reflection of the agent's own competence and thoroughness, not something that happens automatically regardless of who is coordinating the call.
What This Means for Choosing an Agent
Laytime and demurrage outcomes are a genuine, if often underappreciated, reason why agent selection carries real financial weight beyond the agency fee itself, covered in our guide on [ship agent fees and the disbursement account](/blog/ship-agent-fees-pda-disbursement-account-explained-2026). An agent who tenders NOR accurately and promptly, and compiles a genuinely detailed, well-timestamped Statement of Facts as standard practice, is protecting the operator from exactly the kind of documentation-driven dispute that can turn a routine port call into a costly demurrage claim.
This is particularly relevant when appointing an unfamiliar agent at a new port — our [pre-arrival information checklist](/blog/vessel-pre-arrival-information-checklist-ship-agents-2026) covers what the agent needs from you in advance, but it's equally worth confirming the agent's own approach to NOR tendering and SOF documentation before the call, not discovering it only once a dispute has already arisen.
A Practical Checklist for Reviewing an SOF
A genuinely reliable Statement of Facts should show: the exact time and method of NOR tendering, with acknowledgment from the receiving party; the exact start and stop time of every cargo operation period; a specific, clearly stated reason for every stoppage or delay, not a vague general note; and ideally, countersignatures or acknowledgment from both the vessel and shore side at key points, not just the agent's own unilateral record.
If an SOF you receive is missing this level of detail, it's worth raising directly with the agent — both to support the specific port call in question, and as a signal for whether to use that agent again for future calls at that port.
Conclusion
Laytime and demurrage are contractual concepts, but their real-world outcomes are determined by port-level documentation — specifically, the accuracy of NOR tendering and the thoroughness of the Statement of Facts your ship agent compiles during the call. This makes agent competence a genuine financial factor in chartering, not merely an operational convenience, and it's worth evaluating an unfamiliar agent's documentation discipline with the same seriousness as their fee structure or general responsiveness.
Frequently Asked Questions
Q: What is the difference between demurrage and despatch?
A: Demurrage is compensation owed to the shipowner when a vessel is held at port beyond the laytime allowed in the charter party. Despatch is the opposite — a reward paid to the charterer when cargo operations finish faster than the allowed laytime, typically at half the demurrage rate.
Q: When does laytime actually start counting?
A: Laytime typically begins after the Notice of Readiness (NOR) is validly tendered and accepted, often subject to a specified "turn time" delay written into the charter party before laytime formally commences.
Q: Why does the Statement of Facts matter so much in a demurrage dispute?
A: Because it's the actual documentary record used to calculate how much laytime was used — a vague or incomplete SOF creates room for genuine disagreement over delay timing and causes, which is where most real demurrage disputes actually originate, rather than in disagreement over the charter party terms themselves.
Q: Can a poorly handled NOR tendering really cost real money?
A: Yes — an incorrectly or belatedly tendered NOR can shift exactly when laytime is deemed to have started, and at a daily demurrage rate that can run into thousands of dollars, even a modest timing dispute translates into a meaningful, genuinely avoidable financial outcome.
Q: How can I find an agent with strong documentation practices at an unfamiliar port?
A: A maritime services directory such as [PortServiceFinder](/ports) lets you review verified agent profiles by port, and it's reasonable to ask directly about an agent's NOR and SOF process before appointment, particularly for chartered voyages where laytime outcomes carry real financial weight.