Minimum of 3 hours on the clock before open or after close. So if store is 8a - 10p, you'd need to clock in by 5a, or clock out after 1a to get it. 5:01... nope. 12:59... nope. Correct on it only being that portion of the shift though. Differentials vary by store, but is still a flat $ not %. Can be viewed on workday.