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Seems realistic - not everyone's internal clock matches with the 24 hour day. This guy let himself live on a 28 hour day, but the tradeoff was that instead of 7 chunked out pieces of living per week, he had 6. So when is the weekend? Still 2 days, or just 1 now? It presents an interesting set of problems.

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As someone currently doing a PhD, I can assure you weekends don't exist.

Actually, it is normal for it not to match. The majority of people have a natural cycle longer then 24 hours, and our bodies "reset the clock" each morning. This is one of the reasons certain season-sensitve stress/depression related problems exist: for some the changing day length upsets their balance more than usual. It makes sense given that we don't naturally have a fixed day length that we would evolve a system that doesn't bother to try being exact (as there isn't anything fixed to be exact in comparison to).

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