oh god, the minefield that is towels.
Hand towels in kids bathroom and downstairs loo. Washed once a week or so.
DS1 (12)does my head in. He will only use a towel once in spite of me telling him to use it at least 3 times, then he puts it, soaking wet into the washing basket (funnily enough he struggles to put his clothes in there and leaves them on the bedroom floor) so everything else in the basket gets damp and stinky unless I retrieve it swiftly.
DS2 will use whatever is nearest. No cares. Drops on floor after use. Could be anywhere. Bathroom, landing, bedroom, stairs. Wherever he decides he no longer needs it.
Neither child seems to understand the concept of the towel rail. I've said it often enough.
DH and I use/share whats in our en-suite. He will continue to use these forever unless I remove myself and wash them . He likes to hang towels over doors.
Again, we have a perfectly nice towel rail in the en-suite that we paid a fortune for.
I seem to wash towels every three days or so.