Really long scan

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OSX 10.11.6
Just installed free version and running the full scan......still running after 41 hours and steady at 99%.  It seems to be scanning Time Machine files now even though that box is not checked.
Any suggestions

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Now at 64 hours and still running.......

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93 hours......

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Well, 93 hours is definitelly not a usual scan time... Either you do scan Timemachine archives (or their detection is broken), which virtually multiply the number of harddisks to scan by a factor of 20 or so, or the scan has deadlocked. Look at the Activity monitor, if it for example does not eau up 100% of CPU.

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Thx for the reply. The scan does appear to be scanning Time Machine files, even though I made sure the box was not checked.  The scan does not appear to be deadlocked. It is still running, 134 hours now. Nor, does it appear to be using much in the way of resources either. The machine is working normally.  Avast has found several potentially infected mail attachments which were very suspicious anyhow and I would have deleted, and did delete them. These very similar emails did not get flagged by Sophos two weeks ago. I am inclined to let the scan finish as it does not appear to be affecting anything.

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I am scanning my back-up files at over 160 hours and it has 800+ infected files... and showing 20% complete, should I just let it keep going?