Parts are pretty much instant, pcb turn around times are 3 to 15 days depending on how complex they are.

Even in the bad old days of punch cards and priesthoods the turn around for software was faster.

I have a little pcb mill in the garage that I use for prototypes.

To this day I've not met another EE that knows what a voronoi mapping is, or why you'd want one. In a previous startup where I was the software engineer I got through more prototypes for the analogue signal paths in an afternoon than the two other EEs had in the previous week.