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The average length of a year in the Gregorian Calendar is 365.2425 days. 18 years would thus equal on average 6574.365 days.

The exact number would be 365 * 18 (= 6570) + number of leap years during those 18, which may vary between 3-5.

So, 18 years is anything between 6573 - 6575 days.

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14y ago

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