It's called the planet's "YEAR".
Mercury. Its the closest planet to the sun and only takes 88 days to orbit once around the sun.
After Mercury, the planet that takes the least amount of time to orbit the sun is Venus, which orbits the sun in about 225 Earth days.
orbit
orbit
The planet you are referring to is the dwarf planet Pluto, which takes just over 248 years to orbit the Sun.
Mercury. It takes only 88 Earth days to orbit the sun.
A solar year is the amount of time that it takes for a planet to orbit around its sun in a full circle.
A year is the amount of time that a planet takes to orbit the sun (go around it). So a planet that is closer to the sun will have a shorter year than a further out planet because the closer planet orbits quicker.
This is called an orbit.
it is an orbit
Mercury, the closest planet to the Sun, completes an orbit in just 88 Earth days.
Mars takes around 687 days to make one orbit of our sun.