There are 3,650 days in a decade.
Here's the calculation:
1 decade = 10 years
1 year = 365.25 days (accounting for leap years)
10 years = 10 x 365.25 days = 3,652.5 days
Rounding down to the nearest whole number = 3,650 days
Keep in mind that this is an approximate value, as the exact number of days in a decade can vary slightly due to the extra quarter of a day in each year.
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There are 365 days in a year so a decade is ten years which means that there is 3650 days in a decade.