i know mine weighs 3.9kg and nearly 5ft, but she is 13 y.o. But, a friend f mine had her for 6 years, ad i've had her for 7. So, she could probably have reached that size earlier? others might know? My mate fed her medium mice for 6 years... and this clearly isn't enough (he's a good guy, just didn't know, and neither did i until i asked more questions)