When pure yogurt is used as the fermentation source, the fermentation time is 6-8 hours; When yogurt starter is used as fermentation source, the fermentation time is 5-12 hours.

Extended information:

The time to make yogurt depends on the raw materials and environment. If you use yogurt-making bacteria, if you can reach a constant temperature, there is nothing wrong with the bacteria. 5 hours is enough, and the longer the fermentation time, the more sour it will be. If yogurt is used, it will take a little longer, about 8 hours to complete, and the longer the time, the more sour it will be, but it should not exceed 12 hours.

In addition, it should be noted that you should never add boiling water when making yogurt, otherwise the yogurt will not be sour. In addition, it is best to test the constant temperature of the yogurt machine before making. Method: Test the temperature of the yogurt machine. Tap water was added to the yogurt machine, and the temperature was measured with a thermometer after 8 hours of power-on. Too high (above 47 degrees) will kill lactic acid bacteria, and too low (below 35 degrees) will prevent lactic acid bacteria from fermenting.

reference: yogurt machine _ Baidu encyclopedia