I agree, length is far too difficult to measure accurately.

Either way, growth can vary drastically between even two clutchmates. There is also a rare subdivision of ball pythons that you could call "gaint" that is as large as you could possibly imagine ball pythons being, and they grow at a rate to match it, too. Do a search, both here and on google, for "giant ball pythons". The results are really cool. I saw one at a local show, and I got in touch with the guy. If it breeds, I hope to pick up one of the offspring. It would be so cool! I mean, this thing was five or six inches in diameter.