8:00am is eight hours, 8:00pm is twenty hours (20:00).
12:00am is zero hours (00:00), 12:00pm is twelve hours.
12:30am is thirty minutes (00:30), 12:30pm is twelve hours and thirty minutes.
4:30am is four hours and thirty minutes, 4:30pm is sixteen hours and thirty minutes (16:30).
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20.5 hours.
201/2 hours exactly.
3.416666 repeating hours 3 hours, 25 minutes
14 hours, and 30 minutes
There are 1200/60 = exactly 20 hours