Does scanning with a Mac with Yosemite and Time Capsule take a long time?

Avast Mac Security
1

I installed the free Avast for Mac because it has good reviews on CNET. However, I must say that it is on 19 hours and still counting to do a complete scan on machine. It is now and scanning my time capsule back-up and reads 200%. A few questions I hope someone can help me with:

  1. Does it usually take this long?
  2. How do I know when its done?
  3. Put files in chest or delete?
  4. What are the files that say can’t be scanned?

Any help will be greatly appreciated.

Thanks.

2

1]
There is no way to tell how long a scan will take.
It depends on (but is not limited to)

  • amount of files to be scanned
  • speed of the system
  • scan settings
  • how many archives there are
  • other processes running

2]
It will tell you when it has completed

3]
To chest.
If something is falsely detected, you can restore it from there.

4]
https://blog.avast.com/2014/02/28/how-do-i-handle-files-that-avast-cant-scan/