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I would be happy with 10h days I think. I used to do them every second week when in Australia for a job, and I quite liked the extra days off.

I think my problem was, I still liked to get home at the same time each day, so I would go in two hours earlier. Of course back then I wasn't getting up early to exercise either, so it's all kind of a wash now. All I remember was my wife wasn't very pleased with my attitude and demeanor during those times.