How long does it take the body to develop one pound of muscle?

WorkingTxGirl asked: I recently bought one of those scales that measure body fat % along with body weight & muscle weigt via a light electric current sent though the body. I am pretty certain it is accurate b/c it is in line with the calpers test two trainers did on me. What my question is, is how long does it take the body to gain muscle? I realize that you cant turn fat into muscle, but that you have to burn fat and the muscle will reveal it's self, However I want to gain muscle over all. I am curious as to how long it will take to gain one pound of muscle in the body. B/c I really cant afford to lose to much muscle (only 94lbs of muscle) And my trainer said that you will lose some muscle initially while losing fat. So I want to bulk up a little so I dont lose to much muscle. Any input is much appreciated. Muscle Building