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An earth day is divided into 24 hours.
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
Earth gets 24 hours of sunlight each day. There is always 50% of the Earth illuminated by the sun.
A Mercury day (sidereal rotation period) is 58.646 earth days = 1407.5 hours.
Mercury, has 24 hours in a day, the same as the earth and all the other planets in the Universe.