Like the bath/shower towel? I've got 3, and they end up in the wash thats 5 days or a week apart. So like 2 or maybe 3 uses.
Assuming you're actually doing a level of cleaning, then a reasonable rinse off as part of your shower, its just water anyways.
Assuming you're actually doing a level of cleaning, then a reasonable rinse off as part of your shower, its just water anyways.