An egg can last for a significant amount of time without refrigeration if stored properly in cool conditions. When eggs are not refrigerated, their shelf life will depend on a few factors, such as the cleanliness of the eggshell, whether the egg has been washed or not, and the ambient temperature where they are stored.
In general, unwashed eggs with intact shells can last longer at room temperature than washed eggs because washing removes the protective outer cuticle, making them more susceptible to bacteria penetration.
Under ideal conditions, unrefrigerated eggs can last for about 1 to 2 weeks. If the ambient temperature is relatively cool (around 20°C or 68°F) and the humidity is low, the eggs can maintain their quality for a longer period. However, as time goes on, the egg's quality will gradually degrade, and the risk of contamination and spoilage increases.
It's essential to perform a simple test to check the freshness of an egg before consuming it. Fill a bowl with water and gently place the egg inside. If the egg sinks and lays flat at the bottom, it's fresh. If it sinks but stands on one end or tilts, it's still safe to eat but not as fresh. If the egg floats, it's old and should not be consumed.
Remember, it's always best to refrigerate eggs to extend their shelf life and ensure food safety, as refrigeration significantly slows down the growth of bacteria. If you are unsure about an egg's freshness, it's better to discard it to avoid any potential health risks.