This question is meaningless. An Earth Day would be the same length no matter what planet you are on. An Earth Day would be the equivalent of 0.004 Venus days and about the same number of Venus year (it takes a whole year for Venus to go round its orbit). A Venus day is 243 Earth days.
That's 243 Earth days to rotate once. Astronomers call this a sidereal day.
However there is also the solar day of 117 Earth days.
This is planet Earth, so one Earth day is one day on this planet.
It depends on which planet your talking about, for example if your talking about Earth its about 24 hours.
365.243 days -- if you're talking about days it takes for the earth to revolve around the sun. For any planet to rotate around its own axis takes one day -- one of that planet's days. The moon, for instance, is tide-locked to the Earth, so one lunar day is very close to the 28-Earth-day orbital period.
One full rotation of any planet on its axis is the length of that planets day, Earth included.
One day on Neptune equals 16 hours and 6 minutes. This is the same as about 0.67 of an Earth Day.
One farmville day is 23 hours long (according to Zangya FAQ pages), 1 hour shorter than on planet earth...
On Neptune, a day is about 16 Earth hours and 6 Earth minutes long. Neptune has a much longer day than Earth due to its slow rotation, which results in a longer day-night cycle on the planet.
The length of a day on the planet Mars is 24 hours and 37 minutes. One year on the planet is equal to 680 days on Earth.
I think you mean "Venus". That planet rotates in about 243 Earth days. That is one definition of a "day". It is called the "sidereal day". There is another definition called the "solar day", which takes into account the planet's motion around the Sun. For Venus this is about 117 Earth days long.
One full rotation (movement) of the Earth on it's axis is one Earth day. That's why days are different lengths depending on which planet you're on. One Jupiter day's only 10 hours while one Venus day is longer than one Venus year
The planet earth makes one revolution about it's axis in relation to the sun once a day (24 hours).
One year on Mars is approximately 687 Earth days long. A day on Mars, known as a sol, is about 24 hours and 39 minutes. This means a year on Mars is almost twice as long as an Earth year in terms of days.