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Ive used eggs from the store that were 4-6 weeks past the exp. date that had just started to stand up in the bottom of the glass, the floaters would get tossed out. These are refrigerated eggs though. Here is a link to different techniques which used a 8 month unrefrigerated test.
Fresh eggs will keep for four to six weeks without refrigeration but refrigeration will extend this period. The nature of the egg changes as it ages. Yolk membranes become thinner and weaker, while egg whites become more runny. Refrigeration slows this decline.