How to do it???

I am a single mom and teacher. I have recently gone back to school to pursue my Masters degree in Reading and Literacy. It is summer now, my children are at their dads for the next couple of weeks, I find I spend roughly 4-5 hours a day doing school work. I am really concerned over how I will find the time for this when I'm teaching full time and have the kids/house/etc. Curious if anyone else has had this concern and any advice you may have?