That's two hours more per day than I allow. I let the parents choose their 9 hour increment during my open hours of 7:30-5:30. If they want extra, they pay $5 per half hour. If they agreed on an 8:30 drop off, why on EARTH are they thinking an hour to an hour and fifteen minutes early is in any way acceptable?

I would send a letter or email reminding them of the original agreement. Let them know that you refuse to provide care for this length of time.

Good luck. I hate confrontation.