Field Guide 17: a repeatable benchmark for how long a developer new to your design system takes to render a first component and to open a first pull request with it, as 25 checks. The kit has the protocol, two task definitions with fixed start and stop events, a timing sheet, eleven friction codes and a zero-dependency script that validates the sheet, reports median, p75, geometric mean and completion, and compares two runs.
When onboarding feels slow but nobody can say where the time goes, or when you have fixed onboarding and need to show the next cohort is faster for a reason you can name.