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alan is essentially correct. With Archives enabled and sensitivity set to HIGH, Avast scans just about everything.
If you also have the Boot scan set to start on Startup, then more files are added.
The thing to watch is “Does the number of files scanned decrease on a subsequent scan attempt?”.
The amount of files scanned NOW is about right. Run a few scans and then set Avast back to Archives and High.
You mentioned “…the first time”. Avast can a bit long when first used until it “settles down”.