I work in a bit of a dual role, as I teach in the morning, and work in the main office in the afternoon (technology specialist), so I tend to talk to our administrators pretty much every day, several times. That said, my office is almost directly across from both of them, so it would probably be odd if I didn't speak to them. But... I do know there are plenty of teachers in my building that almost never speak to the administrators unless they have to. We have about 1,000 kids in the building, so not a super-huge place, but big enough that if you don't want to talk to someone, you can generally successfully avoid them.