Depends on the person. If you drag your feet it can wear out twice or three times as fast... Also, how much do you walk?

For me it lasts two to three years if I wear them a lot, but typically over 5 years. I put on work-issued shoes or clogs in the office, so I mainly wear them on my short commute or if I go on a trip. If you walk a lot, obviously it'll wear out way faster.