How little time is ok for an employer to change your shift. Our work schedules are posted for the week on Thursdays, but our temporary manager (sandwich shop is new) has been calling employees as late as 8 in the morning and moving their start time from 8:30 to 10:30. He's also calling people in with expected fifteen minutes notice who weren't scheduled for that day. Childcare is a NIGHTMARE for these people. There has been no agreement to have "on call" people to cover gaps. I'll be the manager after store has been open 90 days, 24 days from now. So, I need to know from that perspective, what are the rules?