60 seconds an 1 minute
60 minutes in 1 hour
30 minutes in half an hour
90 minutes in one and a half hours.
So 90 minutes * 60 seconds = 5400 seconds
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One week = 1,209,600 half-seconds.
277.7778 hours.
There are 3600 seconds in one hour. Therefore, 18000 seconds is equal to 18000 / 3600 = 5 hours.
One day is 24 hours, half of that is 12 hours.
3600 seconds is equal to one hour.