An apparent or solar day on Venus is 116.75 days (this is not the same as its rotational period relative to the background stars, which is 243 days).
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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.
Venus' atmosphere consists mostly of carbon dioxide, with clouds containing of sulfuric acid. There are also compounds of chlorine and fluoride.
Mars has a day of 24 hours 39 minutes and 35 seconds