I suspect the answer to this query is "never". Besides the fact that faster-than-light travel is by all reasonable means an impossibility (everything we know about the speed of light and everything that's even been so much as conjectured about it suggests it is the upper limit of speed for everything in the universe), there's also a matter of "will a tiny little speck in the universe somehow collide paths with the destiny of another tiny little speck in the universe", a prospect akin to two grains of sand at opposite ends of a beach coming into contact with one another in less than a millisecond of any given time frame (scale this up for a cosmic equivalent)...
Simply put, as much as the probability that there is other life in the universe approaches certainty, this does not naturally imply in any way that the other life will meet ours. I would put the chances of that as what my statistics teacher calls "zero plus"; the state of probability that most people call "close enough to zero that let's just say zero."
Simply put, as much as the probability that there is other life in the universe approaches certainty, this does not naturally imply in any way that the other life will meet ours. I would put the chances of that as what my statistics teacher calls "zero plus"; the state of probability that most people call "close enough to zero that let's just say zero."