I don't have teenagers but I was surprised when talking with a friend about her 18 year old daughter, who she was saying got tired as she was up so early and she wished she'd lie in a bit longer.
I said 'oh well I suppose she has to dry her hair and all that' and she said that she only baths once a week on Sundays.
AIBU to think this isn't much? She only 'washes' with a makeup wipe, not even a strip wash with a flannel.