It is Neptune.
Mars.
URANUSUranus
pluto has the longest year it takes 248 earth years in one revalution
On Earth, a year is the time Earth takes to travel once around the Sun. The term "year", applied to other planets, may either refer to a standard Earth year, which is a very convenient unit of time, or to the time the planet takes to go once around the Sun. As an example, a "year" on Jupiter takes about 12 Earth years.
Mars, with a orbital period of around 687 days, almost two Earth years (which would be 730 days).
This would depend on the planet, earth takes a year to go round the sun but that is because we named the time it takes for us to go round the sun a "year". The closer to the sun a planet is the less time it takes to circle it.
The dwarf planet Pluto is the planet with a year 248 earth years long.
The dwarf planet Haumea is the planet with a year 280 earth years long.
The dwarf planet Makemake is the planet with a year 310 earth years long.
Mercury - 0.2 Earth years Venus - 0.6 Earth years Earth - 1 Earth year Mars - 1.9 Earth years Jupiter - 11.9 Earth years Saturn - 29.5 Earth years Uranus - 84 Earth years Neptune - 164.9 Earth years Pluto - 248.6 Earth years
There are no planets with a 29-day year. The shortest year is for Mercury, the closest planet to the Sun, taking 88 Earth days for one revolution.The planet with a year about equal to 29 Earth years is Saturn, which takes about 29.456 Earth years to travel once around the Sun.
The dwarf planet, Pluto, has a year of 247.9 Earth years.