900
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5000000
9,000 yearsMillennia is plural for millennium . Millennium is 1000 years so then years in a 9 millennia would be 9000years.
400 of them because a decade is 10 years and 400*10 = 4,000 years which is 4 millennial
A thousand years
1 millennium = 1000 years 2 millennia = 2000 years