It's not necessarily a set rate...Donnyp said:-snip-
I'd rather continue saying Pluto is a planet before i start saying it isn't not because its what i learned or what people thought but because its an Astronomical body Big enough to be seen and rotates at a set rate around the sun. But thats just my opinion.
It takes the same amount of time, but it follows different times, and is on a different orbital plane to the rest of the planets.