Question

How many “centimeters” of time separated the dinosaurs and humans on Earth?

Answer 1

From the quote marks you put around "centimeters", I can see that you
understand that 'centimeters' is not actually a unit of time, and that you're
using it to represent some actual legitimate unit of time. 

But you haven't explained the relationship between the word you used and
the unit you're using it to represent, so I don'[t have the information I need
to make the conversion.

Answer 2

Answer:

There are 24 "centimeters between the dinosaurs and the present and 23.7 "centimeters" between the first human like ancestors