Because it takes 365.3 days for the earth to orbit the sun.
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The total days in a decade if the decade starts with a leap year would be 3653. 365 x 10, + 3.
There are 3652 or 3653 days in ten years depending on the number of leap years in the ten year period. Similarly there are 5,258,880 minutes or 5,260,320 minutes.
Since each year is 365 days (except in Leap years) and there are 10 years in a decade , there are 10x 365 day + 2 or 3 leap days, depending on which 10 years you choose. So... 3652 or 3653 days in a decade.
There were 3652 days in most of the world and 3651 days in Samoa and Tokelau, since they switched from the east side of the international date line to the west side at the end of 2011.
This is almost exactly 10 years (which is 3652 or 3653 calendar days). 3650 days in Julian years (365.25 days) is 9.993 years or 119.92 average months. This is about 9 years and 11.9 months.