The orbit of the sun (a cosmic year) is around 225 million years.
A year (or orbital period) is defined as the period it takes a planet to orbit the Sun.
It takes Mercury 88 Earth days to make one full orbit (or revolution) around the sun.
Planet Neptune takes the most time to orbit the sun, as it is the farthest away.
Jupiter's period of revolution, or its orbit around the Sun, takes about 12 Earth years because it is located farther from the Sun than Earth. This means it has a larger orbit and travels a greater distance in its path around the Sun.
It takes Saturn approximately 29.5 Earth years to orbit the Sun. This long orbit period is due to its distance from the Sun and slower orbital speed compared to Earth.
As it's the furthest planet out, Neptune takes the longest to orbit our sun, taking some 165 years to do so.
Mercury because it is the planet closest to the sun.
Saturn's orbital period, the time it takes to orbit the Sun once, is about 29.5 Earth years.
Venus' orbital period is 224.7 earth days.
Pluto's orbital period is about 248.09 earth years, or 90,613,305 days.
It takes the Earth 365.25 days to orbit the sun once. This orbital period is governed by the planets distance from the sun, and the mass of the Sun and Earth. Kepler found that the square of the period, P, is proportional to the cube of the semi-major axis, a (P2 = ka3).
Venus takes the second longest time to orbit the sun, with an orbital period of about 225 Earth days.