The ideal cooking time for eggs in a slow cooker is typically between 4 to 6 hours on the low setting or 2 to 3 hours on the high setting. This duration allows the eggs to reach the desired level of doneness, whether you prefer them hard-boiled, soft-boiled, or somewhere in between. The specific time can vary depending on the model of the slow cooker and the desired consistency of the eggs.

The reason for these varying cooking times lies in the slow and steady heat distribution of a slow cooker. Unlike a traditional stove-top pot, which boils water rapidly, a slow cooker maintains a more consistent and lower temperature. This gradual heating process ensures that the eggs cook evenly without the risk of cracking or overcooking. According to the USDA Food Safety and Inspection Service, eggs should be cooked to an internal temperature of 160°F (71°C) to ensure they are safe to eat. In a slow cooker, the eggs will gradually reach this temperature over the specified time frame.

For hard-boiled eggs, the longer cooking time on the low setting (4 to 6 hours) is necessary to achieve a solid, white and yolk. Soft-boiled eggs, on the other hand, require a shorter cooking time (2 to 3 hours on high) to maintain a runny yolk. The key to achieving the perfect consistency lies in monitoring the internal temperature of the eggs with a meat thermometer. Once the eggs reach the desired temperature, they can be removed from the slow cooker and allowed to cool before peeling.

It's important to note that the cooking time can also be affected by the initial temperature of the eggs. Cold eggs will take longer to cook than room temperature eggs, as they need to reach room temperature before they can start cooking. Additionally, the size of the eggs can impact the cooking time, with larger eggs taking slightly longer to cook than smaller ones.

In conclusion, the optimal cooking time for eggs in a slow cooker is 4 to 6 hours on low or 2 to 3 hours on high, depending on the desired level of doneness. This method ensures even cooking and safety, as long as the eggs reach the recommended internal temperature of 160°F (71°C).