... looks like it's summer over there ...; I'm wearing Caterpillars at the moment ... :-(
Those rubbers will last long if you only wear them once a week, all depends offcourse on your own weight and the way you walk. There is a big difference in people wearing out shoes, my shoes last pretty long but i have some friends (heavy weights) who can wear out a nice, expensive pair in a couple of months ....
Sincerely yours,
Filip