378,432,000 not including leap days.
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12 years is 378,683,112 seconds.
394,470,000 seconds
600 years = 1.89341556 × 1010 seconds
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.
To calculate the number of seconds in 12 years, you first need to determine the number of seconds in a year. There are 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a day, which totals 86,400 seconds in a day. Multiplying 86,400 by 365 (the number of days in a year) gives you 31,536,000 seconds in a year. Finally, multiplying 31,536,000 by 12 (the number of years) gives you a total of 378,432,000 seconds in 12 years.