simmer for about two to three hours. It takes at least two hours to stew pork trotters soup with ordinary pot. To shorten the stewing time of pork trotters soup, you can choose to use pressure cooker or electric pressure cooker, but when using pressure cooker, you should pay attention to the fact that food and water should not exceed 4/5 of the pressure cooker capacity, and it is easy to be dangerous if it is too full.