3-5 minutes. Cooking according to personal taste. It is recommended to scald beans with hot water. Those who like crispy can choose to control for 3 minutes, and those who like soft and rotten can choose to control for 5 minutes. Take it out and drain it, and you can cook directly. Appropriate amount of salt, sugar and other seasonings can be added during blanching. This will make the beans more delicious. Blanching beans for more than 5 minutes will lead to nutrient loss and destroy water-soluble vitamins.