I don't think so. Everyone isn't the same, some people have more or less capacity to handle long hours. I personally feel that mastery and enjoyment have a large role in how many hours you can work.
If you're working on something you love and are good at, you're going to be productive longer. I think just measuring hours is missing the point.
If you're working on something you love and are good at, you're going to be productive longer. I think just measuring hours is missing the point.