I am not familar with the Arizone State University program, so I would ask someone who has attended or is currently attending to get more information.
Everyone varies as to how many hours they can handle of work...for everyones situation varies...
Since you have the ability to self schedule, that is a good thing...it could either work for you, but it could work against you.
The school that I am attending has a very busy curriculum which keeps us very busy, so for me to work 43 hours a week, it would be out of the question.
Sorry I can't offer much advice, most advice you will get will probably be based on how someone is handling the situation themselves, which isn't your case.