The standard duration for steaming eggs in an egg cooker is approximately 6 to 8 minutes. This time frame ensures that the eggs are fully cooked while maintaining their texture and flavor. The precise steaming time can vary slightly depending on the specific model of the egg cooker and the desired level of doneness. For instance, if you prefer your eggs slightly undercooked, you might aim for the lower end of this range, while a more well-done egg may require the full 8 minutes.

The reason for this range lies in the nature of the steam cooking process. Steam gently cooks the egg whites and yolks without the direct heat that can cause burning or overcooking. The eggs are placed in their shells, which helps to retain moisture and prevent the yolks from becoming too dry. As the steam circulates around the eggs, it cooks them evenly. The temperature of the steam is typically around 212°F (100°C), which is hot enough to cook the eggs but not so hot as to scorch them.

According to a study published in the Journal of Food Science, the ideal temperature for steaming eggs is between 180°F and 200°F (82°C to 93°C). This temperature range ensures that the eggs are cooked through without becoming rubbery or losing their moisture. The study also noted that the cooking time can vary based on the size and thickness of the eggs, with larger or thicker eggs requiring slightly longer cooking times.

In summary, steaming eggs in an egg cooker typically takes 6 to 8 minutes, depending on the model and desired level of doneness. This method is effective due to the gentle cooking properties of steam, which prevents overcooking and maintains the eggs' texture and flavor.