Yeah, I will use a towel until I can smell a "mildewy" smell. But I never use a towel to like dry my hair with (I wring my hair out as best as I can and then tie it up in my knot), so that stretches out towel use quite a bit.

And right now, Jay and I have our laundry done like once every other week and we'll use our same towels pretty much that whole time. I mean, you're clean when you use them.. Just make sure you hang them to dry so that air will be well circulated through the material (like spreading them over the shower curtain rod).. That's what mostly keeps the smellies away. When you wad up a towel and throw it in a corner, then it creates the mildew.