Hi jonser,
Sometimes Ad-Aware can appear to freeze, but no, that is far too long.
Please see this list from
LS CalamityJane can be of use to you in fixing the problem:
Unable to complete scanOften, (as suggested in the post referred to above) cancelling the scan after the first few items are detected, deleting/quarantining those items then trying to scan again, seems to work.
Let us know how you get on.
Regards,
Spike