That’s an entirely separate concept from dev velocity. FWIW I like the name in economics, and can’t immediately think of a much better one.

Frequency is a better term. The dimensions are 1/Time.

If you define distance (wrt money) as the number of people it’s passed through, then it has the appropriate units.

I prefer to think of it as the reciprocal of "residence time", that is how long the money spends at rest in a given account (on average).