The International Astronomical Union definition of a second gives 31,557,600 seconds in a year. That makes 12 years = 378,691,200 seconds. And that is not counting the leap-second corrections that are made from time to time.
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12 years is 378,683,112 seconds.
394,470,000 seconds
About 1,009,843,200 seconds in 32 years.
25 years = 788,923,149 seconds.
20 years = 631,138,519 seconds.