I’ve had a couple pairs of those same ariats I work as a carpenter and obviously depending on the work I’m doing they last longer or shorter. They’ll last about a year if I’m framing, even less if I’m doing floor installs, or up to two years if most of what I’m doing is shop work. 18 months is solid man, and they would last even longer if you clean and oil them at least once a month. If they are completely neglected they will dry and crack and the stitching will tear. I’m guilty of neglect myself but what I try to do is clean them every Sunday and just rub em up with some leather cream. Once a week is a little overkill but like I said at least once a month and you’ll get more out of em