You can control when a Daily.co video call API room is available for meetings and specify how long specific users are allowed to stay in meetings. Rooms have properties like nbf (not before) and exp (expires) that determine when the room is available, while meeting tokens offer more fine-grained control over individual user time limits. Meeting token properties include eject_at_token_exp and eject_after_elapsed, which override room settings for per-user session behavior. Daily.co API rooms can be created with custom properties like nbf, exp, eject_at_room_exp, and eject_after_elapsed to set time limits, and meeting tokens provide a way to control user session duration. The API allows for creating reusable rooms for teachers or other users, generating unique meeting links tied to the room, and setting up time-limited meetings that match calendar events.