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How long is too long to keep them? I normally wear mine until they are falling apart. Also, if I find a pair that is comfy, I tend to wear them all the time. Maybe I should just be wearing them when I'm walking or exercising and change to others when I'm not.
When they stop giving you the support or cushioning they should, they're done.
Running shoes for runners are generally expected to last for 300-500 miles. I'd guess that walking shoes would have about the same lifesapn, but that's just a guess.
If you're wearing these shoes for street (non-exercise) wear, you'd count daily life activities as part of the mileage the shoes have been used for. Personally, I try to limit the running shoes to when I'm actually running, and I have different comfy shoes for normal street wear. On the other hand, there's a lot of overlap between walking for exercise and walking to, say, buy groceries and it doesn't work that way with running.
Oh. And please don't feel stupid. We all learn sometime. You're asking good questions.