Around here, we use a fresh bath towel everytime we shower. I used to use 2-3 a week, and keep them hanging up to dry in the bathroom. But, for the last 5-6 months or so, I've been showering in my parents' bathroom and using a fresh towel is so much nicer! We do hang them up, but that's just so a wet towel isn't wadded up in the hamper.

My mom washes all of the towels and wash cloths every weekend. That includes bath towels, hand towels, wash clothes, kitchen towels, etc etc. Kitchen towels get used until they're nastily wet (doesn't take much until I get disgusted!) and get thrown to the side of the room, until it's laundry day.

It's a lot of towels - usually 1-2 FULL loads, and I've seen it be 3 loads. But that's at least 21 bath towels a week, plus anything extra if we take more than one shower a day, or the dog gets bathed, or we need another towel. Plus all of the wash cloths and other towels. It's a pretty good size hamper full at the end of the week. We just keep stacking it up until no one can lift it, and throw it down the stairs. :P