I used to be the sort of person who would stay at work until I got to what felt like a "good" stopping point in what I was doing. If something wasn't working, and seemed like another 30 minutes might fix it, I would often do it. Of course 30 minutes often turned into 3 hours.

Now I'm much more likely to just go home at the end of the day. I don't really care what fires are burning, they will be there tomorrow and nobody will die.