The hubble telescope.
It is undecided whether Charon is Pluto's moon or if it is in a binary planet system with Pluto (which is actually a dwarf planet). But using Pluto's orbit, it takes about 248 Earth years (90,613 days) to orbit the Sun completely.
Pluto's largest moon is called Charon and it takes 6.39 days to travel around Pluto! It is also the largest moon in comparison to its "parent" planet in the solar system! (about half the size of Pluto)
Neptune. It would be Pluto, but Pluto is a dwarf planet ( a planet that was a planet, but decided that it wasn't a planet)
If you still consider Pluto a planet, than Pluto takes the longest time to move around the sun. If not, Neptune takes the longest amount of time.
The dwarf Planet Pluto
Pluto
Pluto
PLUTO
Pluto
The Hubble telescope satellite.
The dwarf planet Pluto. No "planet" takes that time.
It takes a space robot years just to get to a planet, Imagin Pluto, it would take about 50 years to get to pluto. That's why we just use the telescope.