I think it may depend on a few factors. I don't think I can even manage a 40 hour week productively now, as my other obligations have grown. Whereas, in the e

I think it may depend on a few factors. I don't think I can even manage a 40 hour week productively now, as my other obligations have grown. Whereas, in the early years I could work much longer without reurcussion. This is fairly measurable, as I was writing educational materials and people say the quality was good then. One month I went to Cuba to write, and didn't have to cook, clean or do errands. I also didn't socialize much, but had daily contact with people in my house. I worked much longer weeks, but felt less stress. I also had daily sun, exercise, and healthy food. The second situation wasn't sustainable for more than 1.5 years, but did work well enough. The 3rd situation also isn't sustainable long run, and can be difficult to setup in most circumstances. Just pointing that out to say that the 40 hour limit can be affected by other factors. Right now I want to rearrange my non-work commitments to allow more work time, and also reduce the most mundane work tasks. Critically, when I was working longer, I was just writing. Almost no administrative work.