There are 3600 seconds in 1 hour so there would be 2.5 x 3600 seconds in 2.5 hours, which is 9000 seconds.
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25 Hours
60 seconds = 1 minute 60 minutes = 1 hour → 30335 seconds = 30335 ÷ 60 minutes = 505 (remainder 35) minutes = 505 minutes 35 seconds = 505 ÷ 60 hours, 35 seconds = 8 (remainder 25) hours, 35 seconds = 8 hours 25 minutes 35 seconds.
4 hours and 25 minutes = 265 minutes = 15,900 seconds = 250 minutes, 900 seconds
25 years = 788,923,149 seconds.
6 hours = 21,600 seconds