I have 5 burms of different ages and sizes. My largest is a 12 year old male (George) and he is 13.5 feet. I have a 4 year old female(Fluffy) who is already 10 feet. Males are generally 12-15 feet but I have personally seen a 18 foot male that was probed and was deffinatly a male. I have never seen a healthy male burm only reach 9 feet. George was underfed until the age of 7 at which time he was only 7 feet which is way small for that age and then we started feeding him frozen thawed rabbits which are mor appropriate for his size and now he is 13.5 feet....... Good luck but I think a healthy male burm will be much larger than 9 feet.