25
Improved Answer:-
It one thousand years
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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.
1000
A millennium is 1,000 years
A century is 100 years, and a millennium is 1000 years, so a millennium has 10 centuries.
There are 100 years in a century. There are 1000 years in a millennium.