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631152000 seconds (20 yrs= 5 leap yr + 15 yr = (365*15 + 366*5)days * 24 hrs * 60 mns *60 secs =631152000

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7y ago
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9y ago

631152000 seconds approx. The exact number depends on how many leap years there were in the interval and on whether or not there were any leap seconds.

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Q: How many seconds are there is 20 years?
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