631152000 seconds (20 yrs= 5 leap yr + 15 yr = (365*15 + 366*5)days * 24 hrs * 60 mns *60 secs =631152000
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631152000 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.
how many weeks , months minutes and seconds in 20 years
710 046 000 seconds
60 seconds in a minute, multiplied by 60 minutes = 36003600 seconds in an hour multiplied by 24 hours = 8640086200 seconds in a day multiplied by 365 = 31,536,00031,536,000 seconds in a year multiplied by 20 = 630,720,000 seconds in 20 years.
72000 seconds
1 minute = 60 seconds ⇒ 7 minutes 20 seconds = 7 x 60 seconds + 20 seconds = 440 seconds