It depends on wether you are at a level 1 facility where they staff 24 hours or at a smaller facitity where they only staff during the day. Where I work the OR staff works 7-3:30 m-f, with a crew on call during off hours. They are on call every 7th weekend and approx 5 days during the month. If we are not done with scheduled cases at the end of the day the call crew stays till we are done. The pacu works the same way only we are scheduled until 1730.