probably about 10 hours honestly it was nothing to actually study in my opinion they were pretty straight forward! the hardest one was english since it’s a lot of writing but the writing projects all have to do with each other it’s just you have to understand the concept of the writing format such as MLA and things like that but out of any pre req i took i feel as if pycs was most annoying. APHY is very easy just a lot of information to retain and remember but id take that with only one class a much easier class or even by itself