Non-ritual magically created experimental philosophy

That's not the Limit of Energy, that's the Limit of Creation. Anything that isn't permanently created disappears when the duration ends.

I agree that the Lapis Minor's effect is permanent - never said anything to the contrary. On the other hand, if you create cement with Moon duration, then you have a problem when that ends. It has nothing to do with being "less real" and everything to do with the substance you used to bind dirt into stone disappearing into thin air.