Neptune not Pluto is the most distant planet for 20 years of its' orbit. This twenty year period happens once every 248 years. Then its' orbit swings closer to the Sun and Pluto takes the title.
One year (one revolution) on Pluto takes 164.8 Earth years.
Neptune has two moons. Both moons have unusual motion, which aren't quite understood. Triton the larger of the two moons orbits backwards once every 5 days, 21 hours. It is the only large moon in the solar system to do so. Nereid's unusual orbit is said to be more like a comet than a moon. It is postulated this motion may allow Nereid to escape and wander the solar system.