Years, lifetime. If it is so easy to force people to be polite, societies would already taken that low hanging fruit ages before* *Actually, they do in some so

Years, lifetime. If it is so easy to force people to be polite, societies would already taken that low hanging fruit ages before* *Actually, they do in some societies, such as for example Japan, or my own native Java. People insult each other with more esoteric means instead.