Is that enough normally enough time for the rock to dry?
Depends on how much rain, how cloudy, temps and amount of sun after the rain.... Things can be climbable in 8 hrs - or in 2 days.
From the Red Rock main MP page:
Holds rip off and climbs have been and will continue to be permanently damaged due to climbers not respecting this phenomenon. After a heavy storm the rock will remain wet, sometimes for several days. PLEASE DO NOT CLIMB IN RED ROCKS during or after rain. A good rule of thumb is that if the ground near your climb is at all damp (and not powdery dry sand), then do not climb. There are many alternatives (limestone, granite, basalt, and plastic) nearby.
Marc801 From Sandy, Utah Joined Feb 25, 2014 64 points