Various answers by our contributors: Eggs last about 4-5 weeks in your refrigerator. If you don't know how long the egg has been in the refrigerator, fill a cup with water (enough to cover the egg), and put the egg in the cup.If the egg sinks to the bottom, it is still good to eat, but if the egg floats, it is bad and should be discarded. Therefore, unless you are not expecting to keep the eggs for very long, you should not put them in water. 2  If you must wash the eggs, use HOT running water. 3  Farmers have 30 days from the day an egg is laid to get it to stores. 4  Then, the stores have another 30 days to sell the eggs.