Self study is a good way to go, but Im yet to meet anyone who has done them all in two week stints unless that was all you were doing, and you were extremely disciplined and had plenty of help around...Some of them can be done faster, but Id say performance would slow most down a bit, and most people have a weaker subject(for me it was Aero).
I 'spose you have not met me but I did them in 8 weeks of self study. 1 a week for 6 of the subjects and 2 weeks for performance. I used ATC and BT for performance and it took the vast majority of my time backwards engineering Echo to work out how to do it. I had to repeat Airlaw as I got my exam dates wrong and rocked up to do aerodynamics when It was airlaw. I had a crack anyway and failed with 60% and no documents with me. Oh well.......
I would have put in about 6 hours a day from 10am to 4pm.