whats the ideal time for gre preparation?

Many of you people might be taking coaching usually lasting for 45days. I can assure that 50% of the preparation is completed from coaching itself! Rest 50% depends on how well you practise and master the skills required for gre! After coaching 'a 30days prepartion is more than sufficient'! Provided you study 4-6hrs each day strictly upto 5days before the exam! Each day preparation hours may increase for a person with weak vocabulary!