**If you can occasionally go in and turn the eggs, they'll last longer than just being stuck in the back of a cabinet(my usual, honestly). The very few that weren't good, in mine, were the ones that didn't get turned for a very long time - namely the 2 1/2yr batch - had 2 or 3 eggs in it, where the yolk had sunk to the bottom in the shell, and became attached to it.**
What do you mean by "turn" them? You turn the container around? Or you actually reach into the solution and turn each and every egg?
Thanks.