Well I've averaged about one month a subject, I could have done it quicker but have a lot of work with an airline & airport operations course I am currently involved in. Also, I did HP&l and RT theory both together so that was about 2 weeks for each. Im sure it can be done much quicker than this if time permits. I was in no rush, 2 exams left to complete then USA to finish the flying which I've already started here.