About 6 months ago an Australian herpetologist came here (Indonesia) to write a book about Idonesian herps and he asked me to go romping around in the jungle with him looking for herps, which I was very happy to do. The only reason I don't keep any myself is my wife doesn't like them.
Anyway, back to the herp dude... we went to the Bali Reptile park where they had (it has since died) a 40+ foot python and this guy told me that there is basically no limit, as far as he can tell, as to how big a Reticulated Python will grow. He said there must, of course, be one but he doesn't think he or anyopne else has ever seen a max sized one. He said that food is the sole limiting factor with regard to the size of these pythons. He explained that if you got yourself a young one and continuously provided it with enough, good quality food (like pigs and deer when it got bigger - a dozen chickens for example won't do the trick) then it would just keep growing.
There's food for thought.