How long should a deep scan take in Avast in Mac?

[steveatesh]

I started a deep scan of the computer plus Time Machine drives and its showing progress at 96% for three days, although it appears to be still scanning as the little indicator to the current file being scanned is changing.

Just wondering if this is normal and if so can I expect it to be finished by the end of the month?

Mac Studio 512gig internal Ssd with 2 x 2Tb Time Machine HDD and a 1Tb External Ssd attached. 32Gig RAM, latest MacOS.
Avast Version 15.6