Choose a yogurt preparation program. The standard cooking time in a slow cooker is 8 hours, but I set 4 hours and 30 minutes, and then check the consistency, since the process depends on the quality and volume of milk, the strength of the starter itself. When the yogurt reaches the desired consistency, take it out and put it in the refrigerator for 5-8 hours, during which time the yogurt will ripen and thicken.