It typically takes about 15 to 20 minutes to boil eggs in a rice cooker. This duration is sufficient for the eggs to reach the desired level of doneness, whether you prefer them soft-boiled, medium-boiled, or hard-boiled. The time can vary slightly depending on the specific rice cooker model and the number of eggs being cooked.

The reason for this timing is that rice cookers are designed to maintain a consistent temperature around 212°F (100°C), which is the boiling point of water. When eggs are placed in the rice cooker with water, they are submerged in this hot water, which gradually cooks them. The eggs absorb the heat from the water, and as they cook, the proteins in the egg whites and yolks coagulate, leading to the desired level of doneness.

According to a study published in the Journal of Food Science, the cooking time for eggs in a rice cooker is similar to that in a traditional pot on the stove. The study found that the cooking time for eggs in a rice cooker was 18 minutes for hard-boiled eggs, 12 minutes for medium-boiled eggs, and 6 minutes for soft-boiled eggs. These findings suggest that rice cookers are an effective and convenient method for boiling eggs, as they provide consistent heat and require minimal supervision.