answersLogoWhite

0

I would say about a million years. When I was younger, my family did an experiment, trying to see how long it took an egg shell to break down. It still hasn't to this very day. I was about nine, and am now 59, so I wouldn't give it another thought. Hope this information helps.

---------

The answer depends on where the eggshell is placed. The existence of fossil dinosaur eggs shows they can last a long time. However, if the eggshell is added to a typical compost pile it will decompose as soil bacteria feed on it. (see http://www.paleo.ku.edu/palaios/25/5/smith.pdf)

However, if the eggshell is left on a shelf in your house then it could be there well past 50 years.

User Avatar

Wiki User

14y ago

What else can I help you with?