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The length of a regular year of the Gregorian calendar is 52 weeks and 1 day, and the length of a leap year is 52 weeks and 2 days. However, the number of whole calendar weeks (whole Sunday-to-Saturday weeks) in a year is usually 51. Only years that begin on Saturday or Sunday and leap years that begin on Friday include 52 whole calendar weeks.

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∙ 13y ago

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