86164.0906 seconds which is the time for the stars to do a daily apparent rotation of the sky ( any particular star to be due south on successive days). It is the absolute rotation time of the earth, rather than the rotation time relative to the direction of the sun (solar day, 86400 seconds).
The sidereal day is the time it takes for a planet to rotate once. For Venus that's about 243 of our Earth days.
It takes Venus about 243 Earth days to complete one rotation on its axis, making a day on Venus longer than a year on Venus (225 Earth days). This means that a day on Venus is longer than a year on Venus.
On Venus, a sidereal day (the time it takes for Venus to complete one rotation on its axis) is longer than a year (the time it takes to orbit the Sun). A sidereal day on Venus lasts about 243 Earth days, while a Venusian year is approximately 225 Earth days. This is due to Venus's slow rotation and its unique retrograde rotation, where it spins in the opposite direction to its orbit around the Sun. Consequently, a day on Venus exceeds its year in duration.
Instead of a similar rotational period to Earth's 24 hours, Venus takes 243 Earth days to rotate once. That's called a "sidereal day". In other words, a "day" on Venus is longer than its "year". This is the longest day in the entire Solar System. (Don't forget the "solar day" though. That's only about 117 Earth days on Venus.)
One sidereal day on Venus is 243 Earth days, so a week or 7 days would be 1701 earth days.
The sidereal day is the time it takes for a planet to rotate once. For Venus that's about 243 of our Earth days.
It takes Venus about 243 Earth days to complete one rotation on its axis, making a day on Venus longer than a year on Venus (225 Earth days). This means that a day on Venus is longer than a year on Venus.
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.
The length of a Martian day is equal to 1.027491204 Earth days. The length of one sidereal Martian year is equal to 1.880791 sidereal Earth years.
Instead of a similar rotational period to Earth's 24 hours, Venus takes 243 Earth days to rotate once. That's called a "sidereal day". In other words, a "day" on Venus is longer than its "year". This is the longest day in the entire Solar System. (Don't forget the "solar day" though. That's only about 117 Earth days on Venus.)
One sidereal day on Venus is 243 Earth days, so a week or 7 days would be 1701 earth days.
The closest is Venus with a sidereal period of 243 days
Solar day (24 hours for the Earth): about 116.75 Earth days. Sidereal day (rotation period, about 23 hours and 56 minutes for the Earth): about 243 Earth days. Year: about 224.7 Earth days.
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).
Venus is slow, One day on venus is about 243 Earth days. As I've written elsewhere the Venus "sidereal day" is 243 Earth days, but there's also the "solar day" of about 117 Earth days. Both types of day are just a few minutes different on Earth.
243 earth days
Venus "sidereal day" is longer than its year. Mercury's "solar day" is longer than its year. However, there is no planet in our solar system with a day longer than our year on Earth.