The question turned up at about eight o'clock and got heavier all day.
Everybody was working extremely hard towards sundown. Hang them by sundown. Fill them by sundown. Get the far end done by sundown.
And I did not know when sundown was.
I assumed — and this is the whole of it, this is the entire mistake, and I made it before breakfast and then lived inside it until nearly two — that this was a thing everybody else knew and I had missed.