Hi, It took me about 6 weeks to do them all. Generally read through the books, made a few notes and then hit the PPl confuser. Probably worth taking your time with air law, met and aircraft tech. human factors and the others are failry straight forward.
You could probably do two in a week and know the subject well, that said there are many fast track schools who get the entire lot done in a week, depends on your learning style I guess. You will learn an lot during the actual hands on flying as well.
The confuser is the way forward, not because it is a 'cheat', but because many of the questions are a test of your ability to pick the meaning out of the question, not the actual knowledge of the subject itself. As many on here will tell you the JAA questions are written in 'European English', the amount of times that I knew the answer to a question but there were several ambiguous answers which could have been correct.... had me tearing my hair out
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Good luck
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Tacho