2000000

According to one source, about the year 2,000,000, the Time Lords moved Earth light-years across space, devastating its surface. It eventually became known as Ravolox. (PROSE: The Mysterious Planet)

The Rassilon Era took place around this time. (TV: The Ultimate Foe)

Behind the scenes
While the Sixth Doctor says, "Oh, a long time after your period [Peri]. Er, two billion years or more" in the televised episode, the novelisation of this story reads "A long time after your period. Two million years or more."