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My hoka cliftons are on similar mileage and have absolutely no tread left on them, I can't wear them if it's remotely wet and there's a few bits of pavement I can't go near (anything shiny). But I refuse to get rid of them because they're so ridiculously comfortable now.
In general, my shoes last a long time but I'm a 64kg forefoot runner so my shoes don't get a ton of wear. I ripped all the treads off my trail shoes running on roads though :(
Very personal. My benchmark for decent durability in a road shoe is >1,000 miles. Record is about 1,400 in a pair of Brooks Defyance. Other Brooks models equally hardy. Current Hoka Clifton on 1,100 and counting; midsole still feels cushioned and responsive but outsole very worn to the point of slipping on muddy grass but I'll drag them out as long as possible cos they're so comfy.