That’s a good question. I think my doc said every two years but to be honest I can’t remember. I feel like something keep popping up, like pouchitis or something and we have to do it earlier (yearly) so I haven’t been able to make it to 2 years. So 2 years would be my goal at this point. I’ve only had it for 3 years this fall, so it hasn’t even been that long anyhow.