Thinking about it, I'm pretty sure the number's correct.
Just doing cigarette packet maths... 2nd generation you could imagine maybe thumbs, 3rd generation, maybe different types of knees, 4th generation, i dunno a beard or whatever, with that rate of change amd after an such unbelievable number of iterations, millions upon millions, you would find that a shrew-like protoprimate might evolve into to a creature that tries to harness the earth's internal electromagnetic production as a never-ending supply of free energy, or whatever it was he was working on.
But obviously don't take my word for it, I'm just spitballing and I'm not an expert. I'm sure there were other things involved.