How long does your anti-virus take to scan your PC?

August 31, 2008 1:41pm CST
I'm using AVG free edition with automatic updates. I do full scan all the time. It takes more than 56 minutes to finish. I don't use the computer while it's running a scan because AVG really slows up everything to the point of exasperation. But for it to take almost one hour to run - is this normal?