The Earth orbits around the Milky Way Galaxy, completing one revolution approximately every 225-250 million years. This period of time is known as a cosmic year or a galactic year. Since the formation of the Earth, it is estimated that our planet has completed around 20-25 orbits around the Milky Way Galaxy. However, it's important to note that determining the exact number is challenging due to various factors such as the complex motion of stars and the uncertainty in estimating the age of the Earth.