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Time to prepare for GMAT
To be on the safer side, it is recommended that you start preparing for the GMAT test at least 3 to 4 months prior to the test date. During this preparation time, you should chalk out a timetable and divide your time to prepare for GMAT accordingly. You should divide your preparation into two parts- in the initial months your concentration should be on making your basics strong and getting oriented with the GMAT test syllabus, preparing for important GMAT test topics, getting your doubts cleared and in the final months you should concentrate on practice tests so that you get a feel of real GMAT test.
http://www.gmattutor.com/gameplan.html
http://www.urch.com/forums/gmat-reading-comprehension/91473-gmat-preparation-time.html
http://www.testpreppractice.net/GMAT/how-long-does-it-take-to-prepare-for-gmat.aspx
http://answers.yahoo.com/question/index?qid=20091209143224AAiuJTs
http://www.beatthegmat.com/how-to-study-for-the-gmat-under-one-month-t98.html
http://www.pagalguy.com/forum/gmat-and-related-discussions/14979-how-much-time-needed-prepare.html
http://www.gmatcat.com/Tips.html
http://www.west.net/~stewart/gmat/gmatprep.htm