There are 3.1556926x1010, or 31,536,000,000 (31.5 billion) seconds in 1 millennium.
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This all depends on how many leap years are in the millenium.
The singular is "millenium"; "millenia" is the plural. "Millenium" means a thousand years.
1000
1000000 years
A millennium is 12,000 months.