700 years.
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A millennium is 1,000 years
There are 100 years in a century. There are 1000 years in a millennium.
1000 years in a millennium.
Three millennia (the plural of millennium) is 3000 years. Each millennium is 1000 years. (A millennium is not one million years, despite sounding like "million".)
A millennium is one thousand years. Beware that many people confuse a millennium being a million years due to the fact that millennium contains part of the word million in it. Put in numbers, a millennium is 1,000 years.