Specific underway schedules can vary widely.  Normally ships will go to sea for 10 days to 2 weeks each month for training operations in preparation for deployment. Extended operations away from home port can last up to 6 to 9 months, and ships typically deploy once every 18-24 months. This varies depending on the mission and type of ship your son or daughter will be serving on. Ships on deployment usually spend time visiting ports throughout the world. If your son or daughter is on a shore duty tour, they will likely spend no time at sea during that duty assignment.