I don't think that this is known with any reasonable precision.
164.79 "Earth Years"
neptunes orbit time of the sun is 164.79 years to orbit the sun neptunes orbit time of the sun is 164.79 years to orbit the sun
250 years
Neptune's largest moon, Triton, was visited by the Voyager 2 spacecraft in 1989. There are no other dedicated "satellite robots" sent to Neptune's other moons as of current knowledge.
164.8 Earth years
The Neptunes was created in 1990.
Around 4-5 billion years.
because it so far from sun (4,503,000,000 km)
164.76 Years for Neptune to revolve around the sun.
neptunes gravity is high
One Neptune year is equal to 60,190 earth days.
1620