How many of the families you have now pick up before the new desired close time? Be prepared to lose any families that are later as they may not be able or willing to change their hours. I work a 10 hour day but I start at 6:45 and last pickup is between 4:30-4:45 so I still have my evenings. The families I have chose me because of the early morning as they need to be at work for 7:30-8:00 but it also means home earlier.

Also depending on your set up remember that you are not required to be hands on with the kids every minute of the day and if that means having them up to the table to scribble while you put supper in the oven then so be it.

There is no need to reduce your fee. Even in licensed care anything over 6 hours is considered full time. I would hand out the notice saying that it is necessary to change daycare hours to facilitate the family schedule effective Sept 1. Expect that some of your families my look for alternate care and give notice so be prepared to have to look for some new clients. How many will depend on who you have now that is later than your desired close time.