What do you think about all this stuff that's supposedly being released about alleged UFOs?
Personally I don't think we are lucky enough for alien catgirls to be real, but one can hope.
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The idea of inter-stellar travel all depends on how fast it takes to go 1 light-year. Star Trek / Star Wars speeds or Silent Running? It makes a huge difference. I'll use 100 light-years distance as an average.
Faster than 1 LY per hour? We'd have UFOs everywhere. Kids taking Mom's spaceship for a joy ride, family sightseeing trips. The skys would be crowded.
1LY per hour: Interstellar travel would be like a long road trip, a wagon-train voyage. 100 light years would take 5 days or so, there would be regular contact by now.
1 LY per day: 100 days is a lot! Slower than trans-Atlantic travel by sail. But determined Aliens could easily make the journey, so regular contact would have happened by now too.
Once we get to a week (700 days) or a month (3000 days) it gets much harder to make the trip. Contact would be limited and one presumes VERY expensive too.
6 months or a year? That's getting into "generational ships" unless they live a very long time. Contact would be very rare and likely a huge expedition.
I'm guessing it takes 1-2 months for 1 light year, based on the limited contact so far. But having scouted us thoroughly (and returned to report it) they're going to send a big fleet / armada for full contact / takeover. The gov'ts & elites know it is well on its way & act accordingly to prepare.
How about near-instant but requiring vast amounts of energy input? Think temporary wormholes generated by a megaproject. You wouldn't be able to spam travel, but the distance wouldn't be the limiting factor either. No reason to go to a specific spot until you receive an indication of life, which would likely be a signal traveling at 1 LY/y.
It only takes us 3 days to get the moon, but we don't do it that all that often.