3 years and going!
These glasses are great. I've had mine for 3 years and I have brought them around the world 2 times and back (seriously!). I've dropped them, thrown them, stepped on them, you name it and they have endured. Mine now have a few scratches, but every pair of
sunglasses would with what I put them through. The enamel on frame started coming off a few months ago, the only bad thing. I wear them 8 months out of the year.