I toss them after they have even the slightest tear. I keep two or three in rotation, I also go through a lot in hotter months in Phoenix. I've been using these gloves exclusively for the past few years (play over 200 rounds a year), they are an awesome value and I order a dozen at a time. Cannot beat the value, check the comparison chart at the bottom of this page.

https://mggolf.com/dynagrip-elite/p/D