Shudder. As a young man, I used to inspect new cars for shipping damage. It was well known in the business that an inspector's effectiveness dropped off dramatically as the day progressed. Missed damage could cost our customer thousands of dollars, and yet even blatantly obvious stuff was missed from time to time. I once missed frame damage on a pickup truck that had been chained down a little too enthusiastically. The 45k truck was a write off.

Our inspections numbered in the "hundreds per day". I can't even begin to imagine the mental haze at the end of thousands.

I don't see Watson getting tired.