I've got a 40x30 colonial. 2 floors, plus a basement. The router is upstairs in the computer room (one of the bedrooms.) Just for you, I've walked down to the basement and am posting this from the top of my washing machine, which is about as far as I can get from the router inside my house. Total distance I'd have to estimate at about 40-50 feet, with two floors in between.
Net access is fine down here, but my feet report that the floor is cold. :)