Neither. It is large.
small
The orbit of Pluto crosses that of Neptune and so it is possible for the distance between the two to be very small. At their furthers, the distance is close to 12 billion km.
You can see Neptune with a small telescope or with a good pair of binoculars any time except whenever the Earth and Neptune are on opposite sides of the Sun. So for nine months out of the year, you will be able to see Neptune - as long as you know where to look. It has nothing to do with leap years.
It took twelve years to get from earth to neptune.
It is a giant.
Not compared to earth!
Not very long. Neptune is made of Hydrogen and helium. So you can't breath.
No, Neptune is a planet. Stars are hot, glowing with the heat from nuclear fusion in their core. Neptune is cold, and much too small to have fusion.
No, it is one of the larger planets.
Neptune are 164.79 years compared to earth
Neptune has no solid surface to land on although it may have a small rocky core.
It is one of the four outer giants, Jupiter, Saturn, Uranus and Neptune.