For really hard ice cream texture, freeze for 2 hrs. You are able to try to eat it without delay for soft serve texture, and based on your bananas it would be reasonably thick immediately. It’s easier to kind into scoops right after freezing (this is known as “ripening”). https://cristianomida.shoutmyblog.com/34994831/indicators-on-mango-on-ice-you-should-know