Well, I have 2 adult BCIs in my collection. The male is 7'2", but he's considered to be VERY large for a male. The female is about 8-9 feet, but is also quite large. What you can absolutely count on is 5 feet for a male, 6 for a female. Any smaller than this, you're dealing with a dwarf.
![Smilie](http://www.ssnakess.com/forums/images/smilies/smile.gif)
The average I'd say is 6/7 respectively. 12 feet is damn near unheard of, but I do know one breeder whose female BCI is 11'3". But she is an absolute freak of nature, hehehehe.