Goku, in the week leading up the Cell Games, sensed the Namekians residing on New Namek, which is situated across the universe from Earth, and then teleport to them. On the other hand, Goku could not teleport back to co. on Planet Cereal from Beerus' Planet, meaning the distance between the two is greater than half the diameter of the universe.
Since the ETA for his flight was twenty minutes, as established by Whis, Gas would have to be travelling around 2,446,082,520,000,000c — that is over two quadrillion-times the speed of light.