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A period of ten years is a decade.
Two. Or three. Depends on where the first one occurs in the period of ten years, and what you reckon ten years is.
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.
There are ten decades in a millennium. A decade is a period of ten years, and a millennium is a period of one thousand years. Therefore, a millennium consists of ten decades.
One followed by ten zeroes, or 10,000,000,000 is called ten billion.