Cyclist-years is a unit that has served us well for generations

It started its life as a tool to track the contents of promotional SKU’s, but different stakeholders kept adding increasingly complicated logic until it all depended on huge array formulas and VBA, and a recalculation took 1, then 2, then 5, then 15, then 30 minutes on a laptop, at which point we abandoned the whole thing and everyone went back to keeping track of their own piece manually.

3D printed snd hand wired… by someone else