Hi matisch,
The idea of a 'minimum' number of study hours comes from the general idea that most Test Takers study for 3 months and put in 10-15 hours per week during that time. So some people think that 120 hours is 'enough', while others think that 180 is 'enough.' It's a REALLY dubious deduction. The point about the length of study time is NOT about the total number of hours put in (but you WILL likely need to study a lot to hit your goals). The point is that the type of studying that you'll do for the GMAT is different from the type of studying you would do for a College/University Final Exam. You can't really 'cram' for the GMAT - the process takes time.
Academically, I think that 180 hours of study in 6 weeks is NOT a good idea. However, it might work for you.
First, we need to establish a 'baseline score' for you, so we can get a sense of your strengths and weaknesses and have a result that we can compare future results to. This will require that you take a FULL-LENGTH CAT test. If you've taken one already, then great - what were your scores? If you haven't taken one yet, then you can download 2 for free from
www.mba.com. A FULL CAT takes about 4 hours to complete, so make sure that you've set aside enough time to take the Test in one sitting. You should report back here with your scores.
I'm curious why you're planning to try to do all of this in such a short period of time?
GMAT assassins aren't born, they're made,
Rich