Mars.
The actual length of a day is 23 hours, 56 minutes and 4.09 seconds
The length of a day is primarily controlled by the rotation of the Earth on its axis. The Earth takes approximately 24 hours to complete one full rotation, which determines the length of a day. Variations in the Earth's rotation speed can result in minor changes in the length of a day.
Plants that are not sensitive to the length of night or day are known as day-neutral plants. These plants flower based on factors other than day length, such as temperature or water availability. Examples include tomatoes, corn, and cucumbers.
It's the average length of the "apparent solar day" throughout the year, 24 hours exactly for planet Earth.
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Mars.
the length of day on earth is 24 hours
Mars
The length of the day in th US is the same as the length of the day anywhere else in the world, roughly 24 hours.
the length of a day on Jupiter is average, 9.9 hours
the length of the day is not a fixed unit of time
See answer given for length of Venus day in hours.
The length of a "day" on the moon is 29 Earth days.
During the Autumn equinox the length of the day and night are nearly equal. The length of the day on the equinox is approximately twelve hours.
Mars has a day of 24 hours 39 minutes and 35 seconds
The length of day does not affect the season.