The cooking time for porridge in an electric slow cooker typically ranges from 4 to 8 hours on a low setting, or 2 to 4 hours on a high setting. This duration allows the grains to soften and the flavors to meld together, resulting in a creamy and comforting dish. The exact cooking time can vary depending on the specific slow cooker model, the type of grains used, and the desired consistency of the porridge.

The reason for this range in cooking time is due to the slow and steady heat provided by electric slow cookers. Unlike a stovetop pot, which can reach high temperatures quickly, the slow cooker maintains a consistent, lower heat, which is ideal for cooking grains like oats, rice, or barley. The longer cooking time on the low setting ensures that the grains are fully hydrated and softened, while the shorter cooking time on the high setting can be sufficient for quicker-cooking grains.

According to the USDA's Food Safety and Nutrition Information Center, slow cookers are a safe and efficient way to cook grains, as they prevent the grains from burning and overcooking. The slow cooker's ability to maintain a steady temperature is crucial for the proper cooking of grains, as it allows the grains to absorb moisture and soften gradually. Additionally, the extended cooking time allows for the development of complex flavors, making the porridge more appealing and satisfying.

In summary, the cooking time for porridge in an electric slow cooker is generally between 4 to 8 hours on a low setting or 2 to 4 hours on a high setting, depending on the specific slow cooker and the type of grains used. This duration ensures that the grains are fully cooked and the flavors are well-developed, resulting in a delicious and comforting dish.