Well, it's more of a, ah, like a inlays sortsa thing, I think.

[There is a thoughtful pause.]

Suppose it coulds wear off, over time. No reason to says it couldn't. Don't usually see these things that old or worns out, is all; lyrium's valuables enough that the enchantment itselfs is usually protected from wear, or else it's reclaimed by the destructions of the object.

Suppose in absence of use, it'd last just about forever. Some thaigs got enchantments in 'em laid pert near ten thousand years ago, give or take.