I'm doing them for the sats and hoping it becomes a normal routine. It's miserably cold here, right now, so left to my own devices I wouldn't be nearly as active.

You definitely won't lose any significant muscle mass in 24 hours. If you aren't accustomed to it, the cravings will be a struggle, but it's definitely doable.

I'd suggest finding a spot in your schedule where you're going to have a very busy morning through afternoon. Eat an early dinner the day before, then just don't have anything to eat or drink before you start that busy day.