6.5 is how many earth days it take for one day
It is about 117 Earth days (for the "solar day") or 243 Earth days (for the "sidereal day").
24.62 Earth days and 686.78 Earth days.
Depends on what planet you're talking about. Venus has a rotation of 243 Earth days in a day, and 225 Earth days in a year.
No planet in our solar system has days longer than one Earth year. Venus has the longest day -- it's 243 Earth days.
Venus, the second planet from the sun. One day on Venus would be equivalent to 243 Earth days. However, the length of a Venusian year is shorter at 224.7 Earth days.
One day on Neptune equals 16 hours and 6 minutes. This is the same as about 0.67 of an Earth Day.
Mercury is the planet with an 88-day year.
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.
In the context of your question, a "Day" is defined as the time it takes for a planet to rotate once on its axis, that is (for a solar day) the time between the instant that the sun is, for example, directly overhead, to the next time the sun is directly overhead. Since each planet rotates at a different rate, each planet's own "day" is different. Only Mercury and Venus have days that are "many" times longer than Earth. Mar's day is 1.03 times longer than Earth's, and the outer planets actually have days that are shorter than Earth's, that is, they rotate very rapidly.
Mercury's "sidereal day" is about 59 Earth days long and its year is about 88 Earth days long. Venus has a "solar day" of about 117 Earth days and a year of about 225 Earth days.
Venus is the slowest planet with a rotational speed of 243 Earth days equaling one Venusian day.