Dunno. There's an efficiency in making this less than perfect. It might well be more efficient to make 100 probes that have a 90% chance of making it 1 millio

Dunno. There's an efficiency in making this less than perfect. It might well be more efficient to make 100 probes that have a 90% chance of making it 1 million years than trying to make 10 probes that have a 99% chance. Not to mention there's likely some hierarchy of probes. The smallest ones relay to the bigger ones, the bigger ones can related to the huge ones, and the huge ones can report back home. So maybe somewhere within 100 light years a factory started converting asteroids to probes and launching them at 100k miles an hour and lobbed a few our way. That would have been some 600,000 years ago.