I love lazy whenever haha, but on Sundays I don't like to be too lazy.
I change the bath towel once a week. It's good to buy 7 sets of towels. Changing it once a week will benefit you with beauty wise.
Changing towel once a week helps avoid acne and stick smell. If you over use your towel for more than a week, smell and germs are trap and when you wipe your face, you're recycling them back to your face.
Once a week, I like some time to myself and that's where my little at home spa comes in.