Walter,
There should be no appreciable difference in using the Simple vs Enhanced interface. There is additional functionality in the Enhanced but both scan the same when set the same.
I normally use Enhanced, but when set the same, the Simple interface scan time is not appreciably different.
Mac is correct. Archive scanning accounts for the larger portion of the scan time since it is part of an "indepth" process.
Technical mentioned "sensitivity" (I think) which would not drastically increase or decrease scan time. Sensitivity will change the scan time somewhat, but not from over an hour to under half hour.
Good luck,
techie