Is That A Big Number?

If Time since the extinction of dinosaurs (66 million y) was a standard unit ...

Time since the end of the Cretaceous geologic period (66 million y)...more would be about as big as Time since the extinction of dinosaurs

Age of earliest stone hand axe (2.6 million y)...more would be 1/25 of Time since the extinction of dinosaurs

Age of the earliest city (6,500 y)...more would be 1/10000 of Time since the extinction of dinosaurs

Yes, there's now a book based on these numbers. Oxford University Press: July 2018.