a complete rotation of earth on its axis takes about 24 hours, this is the length of a day.
It is the rotation of the planet one complete revolution that determines the length of a day.
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.