47336400 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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1 year = 365 day * 24 hours * 60 minutes * 60 seconds 1 year = 31536000 seconds for 15 years 15*1 years = 31536000*15 seconds 15 years = 473040000 seconds BY:- SAIFULLAH JAMALI INSTITUTE OF PHYSICS UNIVERSITY OF SINDH, PAKISTAN
15 trillion 211 billion seconds equates to 482,018 years.
15 hours = 54,000 seconds.
631152000 seconds (20 yrs= 5 leap yr + 15 yr = (365*15 + 366*5)days * 24 hrs * 60 mns *60 secs =631152000
Using the fact that there are 52 week in a year, we get that: 500 000 years = 15 724 800 000 000 seconds.