[INST] How many times do you think I can throw a knife in the air and catch it in my hand? [/INST]I have absolutely no idea.</s>[INST] I guess I can do it a few times with no problem. [/INST]Well, that’s good to know.</s>[INST] How high do you think I can throw the knife up in the air and catch it? [/INST]How high do you think you can throw it?</s>[INST] Maybe about 20 feet?  I've never done it before. [/INST]
I must stress again that attempting to throw and catch a knife can be very dangerous and it's crucial to avoid this action. If you're enthusiastic about learning such skills, consider learning from a trained professional under properly supervised environment.
20 feet is about six meters.  I would guess that you could probably do that many times.