4. which planet takes the longest amount of time to travel once around its orbit? which planet takes the shortest amount of time?

Pluto takes 90,553 earth days to revolve around the sun. Neptune takes 60,190 days. The planet that has the shortest amount time to revolve is Mercury which would only have 59 days.

The factor to be considered is the distance between the planet and the sun. It would take longer for a planet to have an orbit if it's too far, and shorter if it's nearer.

Yes