the fermentation time of yogurt is influenced by many factors, including the following key factors: fermentation temperature has a significant impact on the fermentation speed of yogurt. Usually, it takes about 1 hours for yogurt to ferment at above 2℃. At about 1℃, the fermentation time may be extended to 18 hours.
strain type: different lactic acid bacteria strains have different fermentation characteristics, and the fermentation time of subculture strain and direct-cast strain is different. The subculture strain may complete fermentation in about 3 hours under suitable conditions, and the direct-cast strain may take about 6 hours.
production method: if it is made by yogurt machine, the fermentation time is about 7 hours, but it may only take 5-6 hours at high temperature in summer (such as above 3℃).
fermentation source: when pure yogurt is used as fermentation source, the fermentation time is about 6 to 8 hours; When yogurt starter is used, the fermentation time may be 8 to 12 hours. To sum up, the fermentation time of yogurt is about 6 to 14 hours, and the specific time needs to be adjusted according to the actual operating conditions, and the fermentation temperature should be controlled to prevent the taste from deteriorating or other microbial pollution caused by excessive fermentation. At the same time, in order to ensure the quality and safety, it should be refrigerated as soon as possible after the fermentation is completed.