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I have often reflected about this. To me, it feels like that the week is not as "artificial" as claimed in the article. Working 6 days feels like the maximum before a full day of rest is needed for the body and the mind. It's just a feeling though...

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I think working 6 days requires much more than a single day to recover. All things considered, I'd agree that it is the "maximum", but it isn't really common to work 6 days a week in the IT industry, is it? I know for sure it's very common in retail.

The week is related to the phases of the moon. Aproximately four phases per month.

But isn't 4 where the randomness comes in?

yeah, but seven 4-day weeks per month seems weird. And not too many other ways to divide 28

See this comment by another poster: https://news.ycombinator.com/item?id=29431103

Why four phases? Why not 3 or 10? You can divide the month up any number of ways to create “weeks”.

The Romans had 8-day “weeks” https://en.m.wikipedia.org/wiki/Nundinae

Lunar phases are a natural phenomenon, traditionally you observe four phases. The more detailed model knows eight phases.

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