Our rules say that you have to call any time between 4pm the day prior, and 2 hours before your reserve window to see if you've been assigned. Once you've called and been told that they don't have anything, you're off the hook until the reserve window starts. We're better off calling earlier than later, because later gives them more time to put something on your schedule, so I'd love it if we could call at noon instead of 4pm.