There are many reserve lines. Long call (12hrs) Medium call (10hrs) short call (2hrs). Short call has 5 different time spreads that cover the day, can't remember the start times for the early ones but I know reserve C starts at noon, D starts at 5 and E starts at 7. You can get released early and have been told they do sometimes, depends of course. If you don't want to fly you can just sit and wait for a call and they probably won't use you, but each reserve period gets used a little different. Early morning guys I think get used more. You can go on the want to fly list and have a better chance to fly and you can also reserve aggressive pick up if there is a trip in opentime.