i designed a toaster machine back in college it had character, but it would be too small to put up a fight w/ the vehicle-based machines. hahaha.
i'm not really sure how long it takes to develop a design. sometimes it takes an hour, sometimes a few hours & even up to a week. it depends on how strong the idea is, when it pops in my head. a strong idea usually gets finished in a day. otherwise, i take more time to improve it.