The voyage of a submarine depends on the task (or training) and the completion. Conventional submarines can carry fuel, fresh water and food at a time, and can sail day and night for 35-40 days. If they are replenished midway, the time will be longer.

Generally, conventional submarines sail for about 30 days.

Nuclear submarines can sail for 90 days and nights, and the sailing time will be longer if there is enough food.