Completely wild speculation, but I think it will be more than 6 months, because covid variance is much less than flu. There is emerging proof that dissease+vac

Completely wild speculation, but I think it will be more than 6 months, because covid variance is much less than flu. There is emerging proof that dissease+vaccine immunity is much better than dissease or vaccine alone, but it might also be the booster effect. After all, there are other vaccines -- such as hepatitis B where you need a booster after one year (booster 3), before you get your long-lasting antibodies.