Well just because a Burm CAN reach 10' in 16 months doesn't mean they will. I have owned a lot of Burms over the years and I can tell you first hand that ten foot in sixteen months is almost unheard of, it's just as unlikely that the animal reach 20' at all. It's possible but 20' is the exception not the rule. These are huge animals yes but everyone always exaggerates the size as well the requirements they have. Not to mention if this animal is that chronically underfed it will likely not ever reach anywhere near those sizes.