23400 seconds. There is 3600 seconds in 1 hour and 1800 seconds in half hour. You multiply 3600 by 6 hours; then you add 1800 and you'll get 23400.
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21,600 seconds.
There are roughly 31,557,600 seconds in a year. Half of that is 15,778,800.
Six hours is 21,600 seconds @3,600 seconds per hour.
6 hours 42 minutes is 24,120 seconds.
There are 390 minutes in 6 hours and 30 minutes.