I can't really tell you how many hours I studied for (I don't remember), but I will tell you that time wise, I was probably more fortunate that many here. Basically I dedicated the 2 or 3 weeks before the exam completely to the GMAT, and the month or two before that I was not very busy at all, so could afford to study as much as I wanted to.
Basically I went over the quant & verbal review/strategy sections of the Kaplan
book, then I did all of the questions in OG12
and finally I did the practice exams I listed in my original post. In between that I visited this website a lot and did as many of the questions on the quant forum as I could.