I would not do it either. I charge for a 9 hour day with $5/half hour overtime or before or after my hours of 7:30-5pm. We have to do so much work after hours it's ridiculous which adds to our day, cleaning, food and activity and craft preps. We work bloody long days even with having the children here for 9 hours or less.

I bet if you tell the parents they are allowed a 9 hour day or pay a lot of extra money they will find a way to work it out. Grandparents and parents have worked together here when I had a Mom who worked at the hospital on 12 hour shifts to use 7 hour days. If they respect you and appreciate you they will find a way, trust me. Take care of YOU or you will burn out really fast.