Can't remember the shortest one I've done, but in the core stars are on top of each other. I flew from one to another in SC and it didn't take long (nothing to see).
I can't remember how far, but certainly closer than the trip to Hutton Orbital.
It bugs me that I can jump between stars that are close together, but not if they're generated in the same "map" as a binary pair. The core is crazy like this. You can jump to systems which are closer than a binary pair is.