A Mercury day (sidereal rotation period) is 58.646 earth days = 1407.5 hours.
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Mercury, has 24 hours in a day, the same as the earth and all the other planets in the Universe.
8640 hours
If you mean "how many hours are IN one day", then there are 24 hours in a day.
Using earth days and hours . . . Mercury . . . 58.6 days = 1,406.4 hours Venus. . . . 243 days = 5,832 hours Earth . . . . . . 1 day = 24 hours Mars . . . . . . . . . . . . . 24.6 hours Jupiter . . . . . . . . . . . . . 9.9 hours Saturn . . . . . . . . . . . . 10.66 hours Uranus . . . . . . . . . . . . 17.2 hours Neptune . . . . . . . . . . . 16.1 hours Pluto . . . . 6.4 days = 153.6 hours
24 hours are in one day...:)