CH blog post comment is so true (can't hard link to it): There is a fundamental difference in philosophy here. Some startups work 24/7 because they are “swinging for the fences” (to use a baseball analogy). Where other startups, like yourself [37signals] back in the day, are content with simply hitting “singles”. .... Here’s the philosophical difference, you can live a good life on hitting singles, but you’ll never b…
Often it comes down to execution competence. I've seen self-titled startups put in incredible effort...and then come out with something that should have been a weekend project. I've seen casual weekend projects turn into brilliance.
I would offer up that many of those who have to work "24/7" do so as a poor alternative to competence/ability. Some of them, on the flipside, barely put in fulltime hours of real work, but maintain so little self-control and discipline, so focused on the display of heroics, that they seemingly always need to work.
Perhaps that's cynical, but I've never read a story where people legitimately put in an incredible effort and yielded a corresponding output.