It is always interesting to learn how many sets of house keys, car keys, etc the average household possesses. I would love to know for the simple reason, how big of a key holder do I build (see picture). In our household, we each have a key ring for each car and one extra car set for each car, riding lawnmower and pantry, attic, and doors. Therefore, for us, we would need a key holder that would hold at least eight sets of keys/key rings. Does a key holder need to hold more? Let me know what you think it should hold and you could win a discount on the purchase of one.