The term is actually "half an hour" which is short for "half of an hour". This has same meaning as "half hour" or a rough approximation of 30 minutes.
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One half of an hour.
There are 5400 seconds in an hour and a half.
half (1 hour) = 30 minutesIt is 0.5 hours.
Half an hour is 30 minutes.
There is 30 minutes in a half hour. There is no hours in half hours.