While you and other system administrators will probably want to have 24/7 access to your facility, this privilege will likely be withheld from other cardholders, who only require access during normal business hours. To accomplish this, you can use inclusion groups, which are collections of users who have access to various card readers at certain times. Inclusion groups rely on timezones, which divide access by time of day. When you define an inclusion group, you outline when its members can enter the building and which readers respond to their badges.
The administrator inclusion group will likely have a great deal of access throughout the facility. Office workers, meanwhile, will have time-based restrictions placed on their movements to keep them from coming to the office too early or staying too late, when there is little supervision. You can also create specific inclusion groups for visitors and contractors that allow them to move freely or only when and where they need to do so.