It might not be long to them, but you're forgetting that the actual time flow isn't affected. They could travel 200.000 lightyears and maybe it's only 200 years to them, but that wouldn't meant that only 200 years went by for us. It would still take 200.000 years to get here, and the propobility that any sentient life exists when they arive, let alone detectable, would be infinitely slim.
You can't bend the laws of time and space to your liking just because you want to entertain the possiblity of getting freaky with some green lizardwoman.