Reason:

* Orbital Period: A year is defined as the time it takes for a planet to complete one orbit around the Sun.

* Distance from the Sun: The farther a planet is from the Sun, the longer its orbital path and the longer it takes to complete one orbit.

* Neptune's Orbit: Neptune is the eighth planet from the Sun and has a much larger orbital path than Pluto.

* Pluto's Orbit: Pluto, although once considered the ninth planet, is a dwarf planet and has a highly elliptical orbit that takes it farther away from the Sun than Neptune at times.

Orbital Period:

* Neptune: 164.8 Earth years

* Pluto: 248 Earth years

Therefore, even though Pluto's orbit is more elliptical and takes it farther away from the Sun at times, Neptune has a longer year because its average distance from the Sun is much greater.