I purchased the bike at 10k miles and it had new metzelers on it.
I replaced that pair at 32k miles and they still had 1-2mm left.
I'm now teetering at 55k miles and have another set on order since bike week is coming up...
(They'd probably last, but I'll be off the entire week and intend to ride many miles)
22k+ miles per set. Ya, I can live with that!