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Helpful answers
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Aug 25, 2016 8:26 AM in response to jainik007by kaz-k,It depends on HDD size, though 13 hours is too long for verify and repair.
You'd better replace HDD.
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Aug 25, 2016 8:34 AM in response to jainik007by rkaufmann87,We don't know what iMac you have, however I'd recommend that you run either Apple Hardware Test (in extended mode 2-3 times back to back) or if your machine can run Apple Diagnostics run that.