FA is a great book to help you organize your stuff, but is important that you add notes from other books and the Qbanks.
If you don't expand the information is kind of confusing, so once you start with books start also with FA adding notes to it.
Once you have done this you can go through FA i think in about a month, I'm talking about not just reading, but learning it.
Right now I'm starting FA after adding the notes from kaplan books and kaplan Qbank. Just started yesterday and I hope in about a month I will be done.