Seeing as you're from Oregon, I assume your first event is a Pac NW district event? If so, you'll find everything you need about the access period
here.
Specifically, 5.5.2 'Robot Access Period' - Schedule:
Teams may unlock their robot for a total of six (6) hours during the 7-day period preceding any two-day event in which their team will be competing with their robot. The six hours may be broken up in any way the team wishes, with the exception that no single access period may be shorter than two (2) hours. The robot must be locked up in between sessions and this must be documented on the
Robot Lock-up Form each time.