My regular hours are 8am to 5pm (late fees start at 5:01pm, and can not enter until 8am)
My extended hours are: Start at 7:30 and/or stay open until 5:30 (late fees start at 5:31pm)

My reg. hours are at one weekly fee
My extended are at a higher weekly fee

I find most choose my reg. hours so they don't have to pay more. So they pick up before they run errors, unless they get off work early.