Per employee doing rework. To complete tasks which involve taking pieces off and putting them back on in ~30 minutes, you're probably looking at up to 10 people (for example, changing a bushing on a Mercedes that requires the complete disassembly of the rear of the car is around 6 hours of labor).

As a point of comparison, large car manufacturers get into the "how much would a lawsuit and recall cost" when discussing adding costs of $4-$5 per car.