There is no regularly scheduled downtime. That is scheduled when maintenance or repair needs arise. The buildings are locked after 6pm weekdays, and on weekends. They are unlocked at 7am on weekdays. The computer rooms themselves are also locked.
Any full member can get authorization to obtain keys for after-hour access to the facilities.
Please be sure to lock the doors to ZCU computer rooms if you are the last to leave them after-hours, and set the alarm. If you open a door when the little red light on the doorjam is on, you're in trouble. The red lights will go out for 60 seconds, during which you can open one or both doors. If you do not open a door, the alarm system behind it will re-arm after the 60 second period. The little red light should come on.