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 Definition Time unit equal to a number of days, now usually seven calendar days, previously weeks of between 4 and 20 days have been used historically in various places. [d] [e]
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Gregorian Calendar

I believe all cultures used a 7 day week as a basis, plus or minus a few hours here and there for what constitutes a 'day'. --Robert W King 13:33, 5 June 2007 (CDT)

I think the ancient American cultures such as Aztec and Mayan used 13 day and 20 day weeks not the 7 days week. Revolutionary France introduced a 10 day week and 10 days were also used by and ancient Egypt. The USSR introduced a 5 day week in 1929 which was changed to 6 day weeks in 1931 then reverted to 7 day weeks in 1940. Derek Harkness 14:23, 5 June 2007 (CDT)