Half an hour - since there are 3,600 in an hour.
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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.
10800
18,000
2 hours is equivalent to 7200 seconds
24 hours in one day, so 1800 divided by 24 equals 75 days.