I can understand about day , month and year it’s related to repetitive sunrise , moon’s phases and repetition of seasons respectively but there’s nothing I’m able to think about when is comes to week .
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The Bible actually.
Different cultures had different versions of something like a week, but the 7 day week was something that was part of the religious tradition in the middle east and thus baked into Christianity. When the Roman Empire converted to Christianity they adopted it and made everyone else adopt it and those countries centuries later went out and did colonialism and imperialism and made everyone else adopt a 7 day week.
The length appears to be based on the length of the month A full cycle of the phases of the moon takes about 29 and a half days. This means half a month is about 14 days and a bit over 6 hours and a quarter if a bit over 7 days. If you have a calendar based on the phases of the moon, concepts like a fortnight and a 7 day period for a a single phase crop up, even if you occasionally have to add extra days to make everything work.
In places close to the equator where there aren’t strong difference between seasons and Lunar calendars are more common than at higher latitudes where the difference between winter and summer is starker. The ancient Levant region was one such place, also not completely and the 7 day week we use today spread from there.
So TL;DR: You can actually blame the Jews for this one.
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