I think it depends. I mean....when you are first starting, it's almost 3 turns ahead. After things mix it up, it is sometimes just that turn that I'm thinking about. It's often more about strategy for your list and against theirs.
For example, I played against a friend's list tonight that I have often seen. It's 3 Z-95's, a HWK, and Gavin Darklighter. There are crits all over the place and jousting it is really hard. Gavin just needs to point in your direction to get it. It's hard to avoid. I planned a good strategy that had my A-wing zipping up the flanks and then behind. I also had Y-wing and X-wing flanking the other side. The forward facing X-wing was slow rolling. Overall, my point was to not face him directly and flank him or force him to break up his formation. It worked great! Overall, though, I had a hard time getting hits in with my dice while my opponent had great green dice. I had horrible green dice. It was brutal. I think I did tactically sound, but bad results. So.....my overall thoughts are that I had plans for the first 3-4 turns starting off. I had points when I was thinking about how to kill off the Headhunters and NOT be in the E-wing's arc. I thought ahead on these. Often, though, I found I was planning one turn ahead.