What are demurrage and detention charges?
Demurrage is a charge for extra days of container storage at the terminal after unloading. When a container stays longer than the free time allowed, a charge is applied for each additional day.
Demurrage is a charge for delaying a container outside the terminal. It applies if the container has been removed but not returned on time.
How free time works
Free time is the free time allowed for storing or using a container. It is a specific period after which paid days begin. Free time for demurrage and detention is calculated differently. The problem is that at the planning stage, this time seems sufficient. But in reality, the days pass very quickly. Documents are delayed, transport does not arrive on time, there is a pause between stages or some other force majeure occurs - and the free period ends.
Where do additional charges come from?
Demurrage is most often associated with delays in paperwork, queues, and terminal congestion. The cargo is nearby, but it cannot be picked up. Detention is almost always related to internal processes: the warehouse is not ready, transport is delayed, unloading is taking too long, container return has been postponed. Therefore, demurrage often arises due to external circumstances, while detention arises due to how your work is organised.