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It depends on the integrity of the eggshell, I've had eggs go bad in a week and I've had eggs in the incubator for 21 days at temperature that didn't hatch due to being unfertilized (I always break the duds afterward to see) that looked smelled fine. Some books say a refrigerated egg will last 6 months. If you wash your eggs they have a much shorter shelf life. I typically leave my eggs I've collected on the counter till used, usually within a week or so. An unwashed egg apparently has a coating that inhibits bacterial entry----If I have to wash an egg, I will use it within a day or so.