The interview was about three and a half years ago (I can't remember the exact month). He didn't get the green card until three years ago in May. That's the only interview we had. I think his green card is good for ten years (I need to check to make sure, though, but it's not where I can see it right now). He's going to be applying for citizenship soon (you can do that after three years), so hopefully he won't have to renew the green card at all.