it is 16 years
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1 x 10^31
63,113,904.0 seconds
Assuming the three years are all non-leap years, the total number of seconds in three years is equal to 60 x 60 x 24 x 365 x 3 = 94608000 seconds. Assuming one of the years is a leap year, the total number of seconds in three years is equal to (60 x 60 x 24 x 365 x 2) + (60 x 60 x 24 x 366) = 94694400 seconds.
10 quadrillion.
Assuming a period of 13 years has four leap years, then the number of seconds in thirteen years is equal to (60 x 60 x 24 x 365 x 9) + (60 x 60 x 24 x 366 x 4) = 410313600 seconds. If a period of 13 years has three leap years, then the number of seconds in thirteen years is equal to (60 x 60 x 24 x 365 x 10) + (60 x 60 x 24 x 366 x 3) = 410227200 seconds.