"An hour" is correct. That is because the "h" is not pronounced, so "hour" starts with a vowel sound.
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The correct form is in an hour's time.
Since the letter h is silent in the word hour, the correct article to use is an, with hour. It took me an hour to get there.
Minute.
"See you in an hour and a few minutes, Manila." is better.
This has no physical meaning. The correct unit for power is the watt (not watt per hour).