No one really knows for sure yet. Althought I am quite positive that they will have no problems with exceeding the 2 ft mark. Possible 3 or 4, but we will just have to raise them up and see just what we can do with them. Mine is over 8" right now. Twice the length when I bought him 4 months ago. He grew slow the first two months and now he's growing about 2" per month.