There is insufficient information to compare.
We will need to know a little about your system, cpu, ram, operating system, what version of avast, etc.
Do you know what the last file was that was scanned before the freeze?
If you repeat the scan does it stop at the same place?
Personally I don't do a thorough scan (with archives) unless I have a suspicion that here may well be a problem as it takes a very long time. Since your on-access scanners should keep you out of trouble (depending on settings) as all new or modified files should be scanned. I do a weekly Standard Scan of local drives as a part of my system maintenance (without archives, which are inert until opened and at that time they would be scanned by avast!).