What a bunch of B.S. In fact I cannot believe it is even here in Hacker News. "Any time you have worked long hours, it is a sign of a broken process." This is a such a horrible generalization. Successful people always work hard/long hours to make something succeed. Imagine telling your kids that to be successful you should work just 40 hours and no more. They will be easily steamed rolled by other kids that are willi…
If you're doing the work in a situation where adding staff or changing commitments really will not help you, by all means, continue to work, and find whatever tricks you need to stay focused in that time.
Edison had a whole company helping him do his work, and I bet the best of piano players have a cleaning lady, a chauffeur, and a specialist in tuning pianos all helping them to spend more time mentally preparing (including via sleep) and with hands on keys.