Originally Posted by Smooth at FL450

Yes. We have AM and PM reserve blocks. They are referred to as RAP (reserve availability period), and the times vary by domicile. In OAK, AM RAP is 0300-1700, PM RAP is 1000-0000. You have 2 hours to report once notified. And yes, if not used during a day, you're released at end of RAP until the next day. On your last day of reserve, if not assigned a trip, you're released after 7 hours. Helps the commuters get home.