500
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500 years.
Half a millennium is called a "half-millennium" and consists of 500 years. The term "millennium" typically refers to a period of 1,000 years, so half of that would logically be 500 years.
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.