The bottom line is shelf life. The shelf life for an unrefrigerated egg is 7 to 10 days and for refrigerated, it's 30 to 45 days. A good rule of thumb is one day at room temperature is equal to one week under refrigeration..Eggs purchased from grocery stores are typically already three weeks old, or older.f you're an American, you probably store eggs in the refrigerator â and wouldn't think of doing it any other way. Yet, the US is one of the only countries where chicken eggs are kept refrigerated. In much of Europe, for instance, eggs are often stored right on the counter, at room temperature.