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Years ago I balanced an egg
Years ago I balanced an egg on end during the equinox on my kitchen counter. I decided to leave it sit and see what happened. I left a towel wraped about 6" around it so if it fell over it would not fall on the floor. About 3 weeks later, I was in the living room, heard a noise, and the egg had fallen over. So my therory is, you can probably do it for about 1-3 weeks on either side of the equinox. I have never tested this however. I have tried to balance one at other times, and have never been able to do it except during the equinox.