Any character besides the Traveler can be dispatched on an expedition for 4, 8, 12, or 20 hours to return with rewards (note: characters that are K.O'd cannot be sent on expeditions until they are revived). The character is dispatched in name only; they will still be usable on the field. The type of rewards are determined by where the character is sent, but the amount of each resource received may vary slightly. The timer for the duration of each individual expedition counts down even when the player is not online.
A player can recall a character from an expedition at the Adventurer's Guild, but this will forfeit any rewards that would have been granted.
When Expeditions are first unlocked, players can only send two characters on expeditions at once. By raising their Adventure Rank, they can increase the Expedition Limit cap, which increases the number of characters that can be sent out at once.