142009200 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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About 1,420,092,000 seconds in 45 years.
45 seconds is 0.0125 hours.
do 60x45 (60 seconds in a minute X 45 minutes) 2700 seconds in 45 minutes
45 minutes is 2,700 seconds.
1245 seconds