I know there are a couple of threads regarding part time, but I have read them, and I am still fuzzy about rates/hours etc.

So:

What does everyone classify as part time? I see that Play (in another thread) has quoted anything over four hours as full time. Reason that I am asking is because I have a mother asking about Monday to Friday care from 8:30-1:30. My full day, 10 hours max a day rate for a child his age is $50 dollars (par in my neighbourhood), so what do you feel would be a fair rate for me to charge in the case that it's M-F, but only 5 hrs a day?

Any input would be appreciated. It seems I am receiving far more requests for part time care than full time, and I would like to make it worth my while, but not overcharge at the same time.