Ok, gotta ask, you need to watch your laundry like a hawk at home?
But to answer your question, personally, I leave and have never had any issues. Those rooms are often hot and noisy, not exactly the most pleasant place to hang out. Once or twice I have lost track of time and come back to find someone has taken it upon themselves to take my items out of the machine and leave it on the tables. One could maybe feel some kind of way about that, but frankly I get it - more my bad for not being timely.