I believe it also helps scanning speed if you defragment your hard drive regularly.
I should add to my comment that there is another way around the time issue. I don't scan with AVG every day. Defender does a scheduled quick scan once a day (3 minutes, and usually I don't notice it happen). A quick scan with a-squared takes only about a minute and scans the registry and active processes, so it's convenient to scan with that also after each daily update. A Quick Scan with Superantispyware takes about 12 minutes, and I do that twice a week. Then a scan with Spybot and AdawareSE on their update days, once a week, is also just a matter of a few minutes.
So with all this going on anyway, a 40 minute complete scan with AVG once a week isn't too burdensome, and seems to be adequate.
Edited by Alan D, 08 October 2007 - 04:54 AM.
Windows XP Home SP2; AVG 7.5 Internet Security Suite (AV/AS r.t.p, and firewall); Windows Defender (r.t.p on); SuperAntispyware Free; a-squared Free 22.214.171.124; Spybot 1.4 (Immunised, but no Tea-timer); AdAware SE Free; AVG Anti-Rootkit Free; Spywareblaster; MVPS Hosts file (with HostsMan); McAfee Site Advisor.