This all depends on how many leap years are in the millenium.
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how many weeks , months minutes and seconds in 20 years
There is 3 175 200 000 seconds in a millennium with leap years.
4435 weeks 31046 days 745104 hours 44706240 minutes 2682374400 seconds
67,789,433,8976
12 years = 144 months = about 626 weeks = about 4383 days on average = about 105,190 hours on average = about 6,311,390 minutes on average = 378,683,424 seconds on average (not counting leap seconds)