Yep this is what I meant. And I dont think potions or (non returning) arrows have a durability, but they get destroyed all the time. More often in fact because of the no durability, IMO. (just a guess)
I agree though, there is no reason to do this. Go to part II and start clearing. Holding 11 other people up for a min is worse then taking 11 min of your own time after to craft.