Mercury - 175.940 Days. Venus - -116.75 Days. Earth - 24 Hrs.
Mars - 24 Hrs. , 39 Minutes, 35.24 Seconds.
Jupiter - 9 Hrs., 55 Minutes, 33 Seconds.
Saturn - 10 Hrs., 32 Minutes, 36 Seconds.
Uranus - -17 Hrs., 14.4 Minutes.
Neptune - 16 Hrs., 6.6 Minutes.
(Pluto, - 6 Days, 9 Hours, 17.0 Minutes.)
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Mercury, has 24 hours in a day, the same as the earth and all the other planets in the Universe.
If you mean "how many hours are IN one day", then there are 24 hours in a day.
24 hours are in one day...:)
There are 24 hours in a day.
24 hours in a day