I think the Oleson Village project could be completed within a couple of days if you had the time and dedication. As far as finishing the entire course, which I believe is at least three, if not four projects, it depends on how motivated you are. You might be able to pull it off in two weeks time.
I took a self-paced course at the CAD Institute that was supposed to last eight weeks. I finished in three and that included answering ten questions per chapter as well as doing all the assignments. A couple of people in the same class took the full eight weeks.