In order to measure the orbits of the Solar System, the easiest way is to use Earth Days and years as units. The distance of each planet from the Sun determines the time for a planet to fully orbit the sun. For example, a year (the time it takes for a planet to orbit the Sun) on Mars takes 687 Earth days to complete. The inner planets, such as Mercury and Venus, orbit a lot faster than the outer planets, such as Uranus and Neptune, and therefore cause a difference in the speed of the orbits of each planet. The planets vary in solar orbit and distance from the sun as follows:

Mercury- 88 Earth days to orbit, at an average of 5.9 million km’s from the Sun.
Venus- 224.7 Earth days to orbit, at an average of 108.2 million km’s from the Sun.
Earth- 365.26 Earth days to orbit, at an average of 149.6 million km’s from the Sun.
Mars- 687 Earth days to orbit, at an average of 227.9 million km’s from the Sun.
Jupiter- 11.86 Earth years to orbit, at an average of 778.4 million km’s from the Sun.
Saturn- 29.46 Earth years to orbit, at an average of 1.4 billion km’s from the Sun.
Uranus- 84.01 Earth years to orbit, at an average of 2.9 billion km’s from the Sun.
Neptune- 164.8 Earth years to orbit, at an average of 4.5 billon km’s from the Sun.