Hahaha...its an ironic question and answer situation. No one can tell you that. How long have you ridden. How much fatique has your fork/frame gone through. This is not a finite answer as the answer changes with too many variables to guess. I know guys that could drop a storm from really high heights. Give it to me, at my weight, and the technique I use to drop, I could possibly break it. But what if I don't...the stress I put on the frame definately took some life away.
In short (with a longish answer)...no one can really answer the question.