The correct form is in an hour's time.
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A finite part of time is when you state a time. Say if we a truck drives for an hour. We have fixed the time. It doesn't drive for a day, 2 hours, 1.00001 hours, just an hour. Time is infinite if you do not dictate it's limit
12 hour clock but could say the time in a 24 hour clock Analogue describes construction, not hours. It can be either.
It depends on what you want to say most people say 4 hours Can be either. eg A 4 hour trip, it take 4 hours from A to B.
12 Noon
It is 10 am in the form of 24 hours.