It depends on the kind of work. I think there's a distinction between creative work and the more mundane stuff, and any role worth doing has both aspects. I t

It depends on the kind of work. I think there's a distinction between creative work and the more mundane stuff, and any role worth doing has both aspects. I think people only have a few hours of high quality creative work in them a day. But the reality is that most important work has a much larger drudgery component and working longer hours for that most definitely does scale linearly. Fixing bugs or pouring through financial data for inconsistencies is probably going to take you X number of hours no matter how many days you spread it over. In fact, you're probably going to be more efficient doing it in some marathon sessions.