I once heard that the average human spends three years of their life looking for lost things. This is obvious nonsense, unless I suppose you include on your list of items 'lost' things like humility, sobriety, and logic. I lost my gym lock, and I'm trying to find it before I forget my combination. It's been gone about two weeks, so I figure I have at least one more week before that combination is forever wiped from my memory. The past twenty minutes I've spent looking for the lock managed to encapsulate the frustrations of what felt like two weeks. Maybe this is more accurate: "The average human feels like they've spent three years of their life looking for lost things."