I am starting a 2 year masters prep program for adults who have a college degree is something besides music but need to be brought up to speed in order to consider a masters degree in music.  The program starts in the Fall, and it consists of one musicianship class (sight singing/dictation/rhythm exercises) and one theory class.  Both classes are a little over an hour long and are back to back with each other, every week.

My question is, since I have no friends or resources, how many hours a week should I expect to dedicate to study outside the classroom?  I understand everyone is different, however I am looking for a ballpark range (a few hours per week, or something much higher like 20-30 hours per week)?

I apologize if this question is not appropriate in this forum.