"Fermi was somewhat skeptical about the possibility of an extraterrestrial civilization so technologically advanced that it could freely move between the stars. One of his favorite arguments was that such a civilization would be able to colonize the entire Galaxy in less than 300 million years, a short time compared to its age of about 15 billion years. That civilization should have already reached Earth, leaving appreciable traces. But since these traces were not found, Fermi came to the conclusion that the hypothetical civilization does not exist."
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Ch. 9, p. 68
https://en.wikiquote.org/wiki/Tullio_Regge
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