When you run 18 miles a week you should measure the lifetime of your shoes by mileage rather than time. I think 600 miles is about right for a pair of running s

When you run 18 miles a week you should measure the lifetime of your shoes by mileage rather than time. I think 600 miles is about right for a pair of running shoes. It's just that some people run 600 miles in a year, others run that in ten years.