Norton AntiVirus crash after scanning 21 million (out of 5 million) files

A couple of days ago, I manually started an AntiVirus scan on my iMac.

 

Since it crashed, I don't have the specific numbers, but the progress window said something like:

"Scanning 2 items

<filename here>

21,nnn,nnn of 5,199,nnn files.

 

Various questions follow.

 

  1. It had been running for over two days.  Is this "normal?"  I've used Norton AntiVirus on PCs and their scans were much quicker.
  2. Does "items" mean volumes?
  3. I assume the 21 million files it scanned were contents of zipped files?  After it passed the 5 million mark and kept going, I realized I never unchecked the "Scan compressed files" checkbox.  Is there any point to having the full scan also check packed files, since the software will automatically scan the file contents if I viewed/unpacked it?
  4. Since it crashed, is there any proof of whether it did or didn't find any viruses, so far?  I checked the Activity Log but saw no mention at of recent AntiVirus messages.
I'm a bit leery of repeating the scan now, since it takes so long to check my computer, and I don't have a warm fuzzy feeling about the product in general at this point.  You previously had me turn off Auto-Protect (since there was some bug in an Apple NTFS driver that caused your product to crash when checking the Bootcamp volume), and now I can't do a manual scan, without it taking days, and crashing.