A drafting shortcut bit me hard when a whole batch got scrapped
I used to copy old layers to save a few minutes on new projects. This time, I didn't update the revision notes from a similar past job. The shop built fifty units with the wrong bolt pattern before anyone noticed. Now I start every drawing fresh, even if it takes longer. Copying without thinking is just asking for trouble, and I won't do it again.
Isn't it worse than just the fix time though? The real hit has to include the fifty wasted units, the shop's lost hours, and the client trust thing... @elliotbarnes is right on the three days, but that's just the visible part. The whole mess probably cost way more when you add it all up.