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One year on the planet Neptune is the equivalent of 164.79 years on Earth. A day on Neptune is equal to 16 hours and 6 minutes.
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.
In our solar system Neptune is the planet with the longest period or year - equal to about 165 Earth years.
The dwarf planet, Pluto, has a year of 247.9 Earth years.
Now that Pluto has been downgraded to a dwarf planet, Neptune is the most distant planet from the Sun. It takes 164.79 Earth years for Neptune to circle the Sun, so one Earth year would be about 1/165 of a Neptune year (the time it takes Neptune to circle the Sun).
One Saturn year is equal to about 29.5 Earth years.
No planet has. (Planet Saturn has a year lasting about 29 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.