You know how workout machines at the gym are timed for you?

Ok I'm not sure if it's called "machines" but that's what I label them as - AMT, elliptical, and whatever else is timed, do you actually workout for the whole time, let's say it's programmed for 55 minutes, do you stay and do your thing for 55 minutes, or do you do 30 or whatever time you feel like doing? I'm asking because I just go all the way with the time, and I've noticed some people stop after a while, and now I'm starting to wonder if I'm a weird one xD
You know how workout machines at the gym are timed for you?
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