buckle you shoes for gmat

Early deadlines for most of management departments in United States start with september end. Also one need atleast one month time to work on application. So it would not be very unwise decision to write the test before august.So the next question arises how much time one need to preparare for test. my answer would be , it can be two weeks for a person but for another guy even twenty weeks won't be enough. This is a puzzle which cannot be solved with any maths theorem.Is it really difficult to decide the preparation time. The answer is 'NO', if the person can do honest instropection. He/She is the best person judge himself/her self. In my previous post I wrote gmat tests the logical and analytical abilities. So one should set a realistic score target.