I did a "cut" to get ready for Cancun spring break trip...and let me tell you, I definately did it too fast. I was losing 2lbs a week and sometimes more... definately know now that I lost a significant portion of muscle that i worked so hard to gain. Oh I went from ~18% to ~7-8% in a little over 2 months. That was much too fast. You'd need 5 months for sure and slow steady loss is what you want.

IronWorker