I know the exact size: Infinite.
When I was in the university I was downloading many things at the night, while the whole internet bandwith was wasted (hehehehe). Many times my wget -r -l 32 got stuck on things like CGI's that point to itself creating a infinite loop. This was in 2002, but probably still exist many CGI's like this one. I imagine spider programmers have many fun similar histories, of websites that seems "infinite" to the spider. -- -- ℱin del ℳensaje.