1) 10 Months (Started in Jan and took the exam in Oct) - I think it was just about right for me. I didn't really have any prior knowledge of patent law before I started.
2) First couple of months were light, maybe 1-2 hours every other night. Started with some outlines I found online and the Janice Mueller treatise on patent law. After that, I just started banging out practice questions. By doing practice questions, you not only get the feel for the types of questions asked, you also learn how to search through the MPEP. Probably around the June time-frame, I started studying 5-6 hours a night during the work week (basically get home, eat, and start studying till bed) and probably 8-10 hours on the weekend. Mostly just doing practice exam after practice exam. There used to be a website
http://www.freepatentbar.com that no longer exists. That website use to have all the available past exams and used to have this awesome exam simulator. It was setup very similar to the real deal, but unfortunately I can't find anything like that anymore. Once I could blaze through exams in half the time required at 90%+ accuracy, I finished up by reading through all the questions reported on recent tests on
http://www.mypatentbar.com as well as some PCT stuff that hadn't been tested on past exams.
3) F no. That would be a complete waste of time. You absolutely need to know where the most important sections are as well as how to search the MPEP.
4) N/A. Took it before AIA.
5) No way to tell. Depends on your current knowledge of patent law and how quickly you can learn/memorize this stuff. I'm sure lots of people will tell you that 10 months is overkill but I needed it. There was absolutely no way I was going to retake that exam. Still felt shaky going in. If you start intensely from the beginning, it shouldn't take near that long.
6) Memorize as many past questions as you can fit into your brain. It's been a long time since I've taken the exam, but I think I had ~10% repeats from past exams or questions that people posted. The exam is 100 questions with 10 experimental questions, and you need at least a 70% to pass. That's 63 correct answers. If you have end up with 10 repeats, life is that much easier. Just don't get tricked by subtle variations on past exam questions....