The time it takes to stir-fry soybean flour until it is cooked depends on the amount of soybeans and the heat. If you use high heat and the amount of soybeans is small, it usually takes 5-10 minutes to fry. If you use low heat or the amount of soybeans is large, it will take longer. The following are the general steps and time required for frying soybean flour:

1. First wash the soybeans and control the moisture.

2. Pour the soybeans into the pot and slowly stir-fry them over low heat. You need to stir-fry them frequently to avoid burning.

3. Fry until the surface of the soybeans bursts and the brown color inside is exposed, then turn off the heat and cool.

4. Place the cooled soybeans into a wall breaking machine and grind them into powder.

5. If you want a better taste, you can put the ground soybean powder into the pot again and stir-fry until it is completely dry.

It should be noted that the time and heat for frying soybean flour need to be adjusted according to the specific situation. If there are more soybeans or the heat is lower, it may take longer to cook. At the same time, if the frying time is too long or the temperature is too high, the soybean flour will easily burn, affecting the taste and nutritional value. Therefore, it is necessary to control the heat and time when frying soybean flour to ensure the quality and taste of the ingredients.

In addition, the taste and shape of fried soybean flour will be different for different dishes and methods. For example, when making delicacies such as doulao or tofu nao, soybean flour needs to be ground into fine powder, while when making delicacies such as fried noodles or fried noodles, soybean flour needs to be ground into coarse particles. Therefore, when making soybean flour, it needs to be adjusted according to the requirements of specific dishes and methods to achieve the best taste and effect.