A timeout lasts 90 seconds. Play shall not resume until the full 90 seconds have elapsed. The offense may substitute players only during the first 50 seconds of the timeout. After the first 50 seconds, all 7 offensive players must be on the field, and no other offensive players except the head coach can be on the field. The defense may substitute players only during the first 80 seconds of the timeout. After the first 80 seconds, all 7 defensive players must be on the field, and no other defensive players except the head coach can be on the field. This does not apply to timeouts after a goal and before the ensuing pull.