Assuming you are on a semester schedule and not quarters, it averages out to 12 credit hours a semester (assuming you take a full load in the summer).

That isn't to bad. I worked my way through college part time, and loaded out to about 15 credit hours as my maximum. Most of my colleagues who have gone back to school take 9 credit hours if they are working full time.

Hope this helps. You won't have a life... but after it is done, you'll be very proud of the degree.

Paul