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It changes considerably if you bake the egg shells.It takes the calcium in egg shells around 100 years to get in the soil so I'd imagine bone calcium is about the same.
We collect them on a tray until we use the oven next and when we're done, the shells go into the oven as we turn it off. We just put the tray directly onto the bottom of the oven. Don't stack the shells, you'll want them 1 deep, not both halves together. By the time the oven is cold, they've changed and become very brittle. We crush them by hand at this point. And those go into the garden. Even not crushing them, you'll find they vanish very quickly in compost.
Many decades ago, we ran a test and it was the unbaked ones that were still whole after 2 years in the compost pile. The baked ones were gone within months even though we had not crushed them. Now we crush them as well.
