These lasted about a year. I guess they are just another consumable, but I'm always surprised how quickly I trash them. With each new install I promise myself I'll be careful, use cleat covers more often, and try to not walk in them. Then I break my promises.
Cleat covers are a pain. They almost, but don't quite fit in a jersey pocket. And when I use them I inevitably try to ride again without taking them off. (It doesn't work.)
My prediction: I'll repeat the same process with these.