I agree. It depends on landing. Tranny, rider weight. front heavy rear heavy. The frame should hold up to quite a bit (I wouldn't go over 6 ft but I am 250pnd) but the rims may break under that kind of duress. Especially if you have stock rims which are crap. (a friend of mine did a 7ft drop to flat and broke the stock rim in two. He is a small rider and smooth).

Anyways, too many variables to help you out much more than that. Do a 3 footer. If you hear creaking or cracking and the rear rim is slightly off you found a limit to your skill and current bike setup