Congratulations on getting the call!!!
I applied and got my ranking almost two years ago. The list expires on 2/1/17
And what is extremely disappointing is that if you are not called by the expiration, you have to go through the interviews again because they change some of the scoring and can't have people on the list scored differently than others. So in other words, right now I'm two numbers away from bring called. Do to be so close after two years, only to possibly get bumped back down the outer would be so disappointing.