Do we have enough headsup on these to even plan such a mission? Was under the impression that by the time we realize they're there, they're already halfway out the door...

What's the minimum time to intercept something like this? Do we need 6 or 7 years, or is 3 years enough?

Feasibility of a Spacecraft Flyby with the Third Interstellar Object 3I/Atlas https://news.ycombinator.com/item?id=44649150

Intercepting 3I/Atlas at Its Closest Approach to Jupiter with Juno Spacecraft https://news.ycombinator.com/item?id=44717239