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I have only ran 100 miles in mine so fart but I think the outsole will last quite long, I am more concerned then about the upper which to me seems very thin and vulnerable and at risk of wearing out quickly. My pair are as good as new and I appreciate the shoe a lot, they are rarely on my feet during training, mainly then for speed workouts (once I have ran 10 miles/16k) in them which worked just fine. They are however my absolute favourite for 5k and 10k racing. I have yet to try them at a half marathon, perhaps will do that next season.
Agree with the comment above about the laces, I have kept the originals but they need to firm double knot to stay in place during running.