24 hours in a day and that is one rotation.
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A Mercury day (sidereal rotation period) is 58.646 earth days = 1407.5 hours.
One full rotation of the hour hand is 12 hours. One full rotation of the minute hand is an hour
Neptune has a rotation period of 16 hours 6 mins 36 secs.
If you mean "how many hours are IN one day", then there are 24 hours in a day.