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A month can be an interval of 28, 29, 30, or 31 days. (Look at a calendar.)

640 days =

20.6452 months of 31 days. (rounded)

21.3333 months of 30 days. (rounded)

22.0690 months of 29 days. (rounded)

22.8571 months of 28 days. (rounded)

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13y ago

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