I am down cleaning out my cold room and came across a bucket of eggs I preserved using the water glass method 3 years ago, the date on them was Oct 2020. You can easily preserve them for 18 months but thought “what the heck” lets see how they are after 3 years. Out of 2 dozen, 6 were still in tact and didn’t float when placed in a glass of water (indicating they were “fresh). I broke a couple open, scrambled them, tasted them and you would never know they weren’t fresh today…well maybe the white was a bit more runny but perfectly edible. If you can get an abundance of eggs for a good price and aren’t fortunate to have a freeze dryer or a mother who does this is a great way to preserve eggs for storage.