9,000 years
Millennia is plural for millennium . Millennium is 1000 years so then years in a 9 millennia would be 9000years.
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A thousand years
There are 1,000 years in a millennium, so 5 millennia would equal 5,000 years. This is calculated by multiplying 1,000 (years in a millennium) by 5 (number of millennia). Therefore, there are 5,000 years in 5 millennia.
1 millennium = 1000 years 2 millennia = 2000 years
1 millennium = 1,000 years so 3 millennia = 3,000 years. Simple!
900