Today is the second day in a row that I've stayed quite a bit later than I needed to (in order to make up time), but I haven't minded it either day. I think I can be just fine working longish days as long as I have interesting stuff to do and as long as I can work at my own pace, with liberal LJ and email breaks.
I don't think I could do what my boss did today, though. She was out sick yesterday with the flu, and she came in today, still feeling not-so-good, because there was just too much for her to do. I think that will be a major signal for me to quit, when I feel I need to come in when I'm sick just so I can get stuff done. Well, I dunno, maybe if it were my own company, it would be different. But working for someone else, for a product I don't really care about? No way.