None of them.
The nearest planet to have a day-length of 9 hours is Jupiter, on which days last 9 hours and 56 minutes precisely. Under 10 hours.
Mercury.
Earth and Mars. Earth's day is 24 hours, while Mars' day is 24 hours 37 minutes.
24 hours
It's about 17 hours and 14 minutes long. (Incidentally, for the outer planets there's very little difference between the lengths of the sidereal days and the solar days.)
Earth has a 24 hour day and Mars has a 25 hour day.
Mercury.
23 Hours 57 Minutes and 14 Seconds
Earth and Mars. Earth's day is 24 hours, while Mars' day is 24 hours 37 minutes.
The two planets that have the same length of and Earth day but shorter than a Earth day are Neptune and Uranus because a Earth day on Neptune is 18 hours and 30 minuets Earth time, And Uranus is 17.24 hours. Thus Neptune and Uranus is closest to an Earth day being below 23 hours and 56 min (24 hours rounding).
1 day on Mercury is 4222.6 hours. Little more than 3246 hours (middle of 14 days.
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If a day took 40 hours, then a day would take 40 hours.
24 hours
by the rotation of the planet
the length of day on earth is 24 hours
the length of a day on Jupiter is average, 9.9 hours
See answer given for length of Venus day in hours.