The length of mission depends on the type of mission chosen, ranging from a few hours to a week. Missions can also be run while the player is offline. Each ship, depending on type, abilities, buffs, equipment, and crew, has different abilities and scenarios that are best suited for them, such as a ship that can sink submarines or a ship that who works better in a group. Despite the 86-87% success chance, the second naval mission of the starting quest chain will always fail and sink your destroyer, so do not be alarmed. The third naval mission should always succeed.