There are 31,536,000 seconds in an average 365 day year, so multiply that by 29 years and you get (approximately) 914,544,000 seconds in 29 "average" years. To be more precise, you would have to include leap years and fractions of years.
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29 calendar years will contain either 10,592 or 10,593 days,yielding 254,208 or 254,232 hours.Using the SI value for a year, as defined in seconds, the total number of secondsin 29 years is (29 x 31,557,600) 915,470,100 seconds, divided by 3600 yields254,214 hours
About 1,009,843,200 seconds in 32 years.
20 years = 631,138,519 seconds.
10 years = 315,569,260 seconds.
25 years = 788,923,149 seconds.