In hindsight, this is most probably a joke, but I still looked it up.
Earliest humans, Homo Habilis, appeared 2.4-1.4 Mi years ago.
Apes as a whole only split from other monkeys around 24mya, and genus Homo shares ancestors with chimpanzees about 7mya. Evolution happens both incredibly quickly and incredibly slowly depending on what you're comparing it to.
Yeah but the Silurian civilization is gone though :-/