Since I usually walk to the appt, and it takes almost an hr to get there, I KNOW I need a shower when get there!
...and since I can't return home slathered in oil, or smelling of "other woman", I NEED a shower after as well (and bring my own soap!).
I had noticed this seemed "off the clock" for her, but I clean up pretty quickly to avoid any frustrations, and have never felt rushed.
I tip to show appreciation, and help keep things smooth.
So far, so good.
But over all, I'm not too concerned about the clock, preferring instead to help make it a really great relaxing, intense, memorable, and fun time.
If she's happier, she will make me happier!
Just out of curiosity, I did check the times carefully on a recent visit, and I was certainly not short-changed.
...YMMV...