Even fiat has kind of slow settlement times.
Lyn Alden in BCB091, Solving The Money Velocity Problem | Blue Collar Bitcoin 📺 #123659

In the last Tweet of this Twttter thread is:
Broad Summary: Settlement intermediates create time delay and require debt to function.
Because bitcoin can settle “physically” at the speed of light, money velocity is no longer constrained by debt.

Here's a paper that looks at velocity of money for "crypto", but I didn't do much more than skim it.

Another paper that I didn't do much more than skimming for nuggets:
MicroVelocity: rethinking the Velocity of Money for digital currencies https://arxiv.org/pdf/2201.13416.pdf

This following Reddit post (and concepts) is describing a somewhat related concept. It was interesting. Just thought I'ld share.
nobody seems to be discussing this (money theory and lightning network) https://reddit.com/r/BitcoinMarkets/comments/8qtwvd [Teddit]