Venus has the longest period of rotation. It's about 243 Earth days.
To revolve around the sun: Neptune. But just to rotate: Venus.
We'll probably never know since there are at least trillions, maybe quadrillions of planets out there.
mARS
Mars takes the longest of the inner planets.
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.
Neptune takes the longest to revolve around the sun.
Uranus
URANUS TAKES EIGHTY FOUR DAYS TO ROTATE
mARS
Mercury.
Mars takes the longest of the inner planets.
it isn't always like that because Venus takes 243 day to rotate!
Venus
Neptune takes the longest as it is the farthest away.
It depends which planet you mean - the Earth takes 23 hours & 56 minutes to rotate once.
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.
Venus.
Neptune takes the longest to revolve around the sun.
There is no such planet known. The planet with the longest rotation period is Venus. That rotates in about 243 Earth days.