More than 30 minutes. According to the query have to come to the doctor's network shows that the saponin contained in the plum bean curd after heating 100 degrees Celsius, heating for more than 30 minutes, can be its toxicity destroyed, not because of the greed to save time, and reduce the heating time. Plum bean curd is a common vegetable, plum bean curd is rich in dietary fiber, vitamin B, vitamin C, plant protein and other nutrients. Because the plum bean curd contains saponin, saponin has a strong stimulating effect on the digestive tract, if you consume the plum bean curd that is not fried, it will cause stimulation of the gastrointestinal tract and cause symptoms of poisoning.