Yes, if we allocate an observer. The technician cannot time everything while doing it.

Allocate that time explicitly. Otherwise the study meant to expose free labour begins by assuming another person works for nothing.

Do you have first released checks, before correction?

Historical failures and later passes are linked. First-release method is identified. Correction duration is not.

Then retain the route evidence and leave the duration uncertain. The current study can measure work and waiting separately on identified brackets.

Has someone approved the observer's time?

Approved. Study scope and observer assigned. Purchase comparison stays provisional until the observation is done.

Useful. What range of incoming brackets did the process specialist select?