Yeah that's how big you'd hope to raise a RTC, but honestly even in all the aquariums with 10,000 gals + I've been to around the world I have never seen one even close to that size. Maybe 4' max is what I have seen in captivity. Not saying it isn't possible, but good luck with that lol. Would require you to raise your RTC in optimal conditions for 30 or more years!!! I'd really like to see it happen, but doubt I ever will! An 80 pounder maybe, but the one in the pic is just a pipe dream for nearly any fish keeper on the planet. Just not gonna happen. That my friend's is a genetic freak!