Between 5-6, but I usually avoid them. Before 5, they don't taste that good and after 6 they make me vomit. I love banana, but ripe banana have too much sugar and my body just reject them. If I could just have anything I like, 5-9 are perfect on their own, more than that I like them with peanut butter, bread, cinnamon or oatmeal. I prefer banana a bit green or not too sweet