AntiVirus 11 Run Time

I just downloaded internet security package 4 for my Mac (OS 10.5.8) and am running AntiVirus11 for the first time on the whole system. It's now been running for almost 11 hours, and has scanned 6 million files of a stated ***1.2 million files*** to be scanned. Can that be right? It's still running. I turned off scanning compressed files before it started.