Well here in the local news they were saying that it really starts waning at 6 months and the EU is planning to reduce the validity of the certificate to 9 mont

Well here in the local news they were saying that it really starts waning at 6 months and the EU is planning to reduce the validity of the certificate to 9 months because of that. So I do expect it to be a 6-monthly affair. But probably just one shot every time because it's a booster. But I'd be ok with every 3 months too though I agree there should be no need for it. I'm high risk and my work did an antibody test after 3 months, and I was full of antibodies still at that point.