Some Aspects of Laytime Calculations: Interruptions and Exceptions

Laytime constitutes a central element in voyage charterparties, determining the time allocated to charterers for cargo operations without incurring additional charges. Yet, the rules governing its interruption and exceptions represent one of the most complex and disputed areas in maritime law. These provisions define the specific events or conditions under which the running of laytime is suspended or excluded altogether. The article explores the legal framework and practical implications of such interruptions, focusing on causes beyond the parties’ control — including weather conditions, port congestion, strikes, and mechanical breakdowns — as well as on contractual clauses that expressly exempt certain periods from counting as laytime. Attention is also given to the burden of proof and to the role of causation in determining whether time should count or not. By analyzing case law and commercial practice, the article aims to clarify the principles guiding the fair allocation of delay-related risks between shipowners and charterers.