See I do the opposite if anyone is looking for part-time (by part-time I mean not attending daycare 5 days a week) my rates are higher due to the loss of income of the days not attending. I don't recommend doing half day pay because you will loose ALOT of income. Charge by day (even better by week) do not charge by hour of half days because it gets to messy and complicated. A day is a day so if that want the space for that day they must for the full rate for it.