My experience with this sort of thing is that despite thrice-weekly lifting sessions, I lose a LOT of muscle. Just a heads-up for anyone thinking of trying this.
My experience is like the GPs (I only lose muscle if I don't exercise while fasting).
Do you have "nontrivial" muscles? My experience is that I don't lose muscles I use (If I don't jog, I _do_ lose leg muscles; if I'm not boxing or swimming, I _do_ lose arm muscles; but if I do both, and balanced exercises like crunches, squats, etc - I don't seem to lose anything).
For more details i can recommend "Body by Science" by John Little and Doug McGuff.
Or google "muscle recovery time" and read through