I finally found some running shoes I really like, which of course means the company discontinued them. They are still available on clearance, so I can buy some extra pairs now.
How long will they last stored in a cool, dry, dark closet before the soles start to break down (or something else happens)? I usually get 400-500 miles out of my shoes, which is probably about 6-10 months. How many extra pairs should I get? Opinions and anecdotes welcome.