how long is a billion seconds
60(seconds) x 60(minutes) = 86,400 86,400 (seconds in a day) x 11.5(days) = 993,600 (seconds in 11.5 days) Slipnot misplaced the decimal point, A billion (with a B) seconds is 31.7 years. 60 seconds per min, 60 minutes per hour, 24 hrs per day, 365 days per year..4 hours = 1 day (so that is 86,400 seconds). If you divide 1,000,000,000 by 86,400 you get 11,574.07 days. If you divide that by 365.25 (the number of days in a year) and you get 31.688 years. poldi Â· 7 years ago.