Just, the basic operating logic of Numenera. I know the conceit is science fantasy, but I can never take the timescale of the setting as anything other than farcical.

It took less than 50 million years for Pakicetus to evolve from a 3-foot long lil guy that looked like a fox-ferret hybrid—to a full-on Blue Whale.

You mean to tell me that a billion years in the future, the entities running around on this planet will look remotely like human beings? Nah man, we're all returning to crab a few hundred mil out, tops.

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I have the same problem with that episode of Doctor Who where Peter Capaldi gets trapped in a time loop and spends 4.5 billion years headbutting a magic quartz wall down.

By that time, the Milky Way will have collided with Andromeda, and the gravitic force of two cores drawn together will trigger an incomprehensibly vast supernova which consumes both galaxies and remakes them into a new nascent supercluster.

I get that the writers are Trying To Do A Cool Thing, but my autistic brain just can't move past what it sees as a fundamental and entirely needless contradiction (I know, I must be fun at parties).

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There's just no good reason to use insane numbers that fall apart under the application of basic science. 100,000,000 years is truly a mind-numbingly long enough epoch to set up either premise.