There are 3.1556926x1010, or 31,536,000,000 (31.5 billion) seconds in 1 millennium.
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31,556,926,000 seconds.
There is 3 175 200 000 seconds in a millennium with leap years.
There are 31 556 926 000 seconds in a millennium
There are 3.1556926x1010, or 31,536,000,000 (31.5 billion) seconds in 1 millennium.
This all depends on how many leap years are in the millenium.