If I'm distracted, I can sit still in a car for hours. Same with at home, barring position changes (at least once an hour if not more). Granted, my answer goes from hours to minutes if we're not counting shifting around a little.
If I'm not distracted, I'll probably be like "why am I stuck here I gotta mooooooove". Also I'll then have to think I have to pee the whole time because that's what I do when I'm stuck on a long car ride. D: