> It seems I value working less than other people
I don't know anyone who works 7 days a week.
I stay productive by eliminating idle time between tasks. Switching should be seamless. If at any time you don't know what you are going to do after you've done the thing you are doing you are doing it wrong.
My coworkers all work harder than I do. End of the shift I've done just as much but they are totally worn out (when I go to my next job)
I do procrastinate for a total of 20 min or so by spending excessive attention on details. This amuses me greatly specially when it infuriates coworkers.
It is like a sport, the work it self is not important it is all about the experience. If I ever get bored with this routine I take 3 or 12 months off right at that very moment. The thought is very comforting. No way I'm going to push it into burnout.
This is typically easier with physical labour I think (only 'typically': of course there are variations). Our bodies are far better designed for physical tasks than our minds are for purely mental ones. The latter mismatch forces a variety of coping workarounds, amongst which are task-switching costs.
For example, I spend some hours each month helping a local non-profit with their site and promotion. Switching to their simpler tasks is similar to rest for me.
Just goes to show how different people can be. Which I guess we already knew.
I'd be interested to read a follow up blog post titled: "How I got down from 200 productive hours a month to something a bit more reasonable for sanity and health's sake".