Short cycles make no sense. Your HPTA still will get suppressed, despite what Bill said, and gains are going to be very poor, mostly water, if you use aromatics, or almost nothing, if you don't.
I don't know, but, ask Bill, how long does it take for human body to increase protein synthesis to the point were any effect is visible? with anabolics, of course. And, to adjust all the supporting systems, so you can carry those muscles after the cycle, or at least some of them. Do our bodies adjust that fast to such a changes? pretty much unnatural changes.