It has been orbiting the sun since it was formed.
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Pluto's orbit sometimes carries inside the orbit of Neptune. One time, Pluto was stuck in Neptune's orbit for around 20 years.
Neptune takes 164.79 Earth years to orbit the sun once.
Neptune.
It take 164 Earth years for Neptune to orbit around the sun once.
Planet Neptune takes the most time to orbit the sun, as it is the farthest away.
A month on Earth is based on the amount of time it takes for the moon to make an orbit. Uranus has at least 27 moons, each with a different orbit time, so a month on Uranus doesn't make much sense.
Neptune is always the outermost planet. For about 10% of the time the dwarf planet Pluto crosses inside of Neptune's orbit.
Beyond the orbit of Neptune
Neptune.
It orbits the Sun all the time! You probably meant : "What time does Neptune take to complete one orbit around the Sun?" The answer to that is: about 165 Earth years.
Neptune takes around 165 Earth years to complete one orbit around the Sun.