WLAN Service Schedule is what you need to only allow use during specific periods of time, but applies to the WLAN on all APs it's advertised on.
The solution to your inquiry might require TWO Guest WLANs (maybe very close names), and splitting your APs into two AP Groups.
You can include one time limited Guest WLAN on one group of APs, and different time limited WLAN on the other AP group.