Hello Sandi Fanelli,
It is different for everyone.
If you do nothing but study, it could probably be done in half the time; but, how much is retained? This all depends on how much of the content you know before starting the course, also.
I personally like to take all the time or more, to make sure I understand the material completely.
While working, it is harder to find the time to study, leaving any down time to relax in the dust, until exam time.
Then, we are constantly studying and learning after any and all exams, anyway.
Enjoy your studies.