The 20 minutes is on average, don’t forget that. It depends ofcourse when you go online unprotected. When a new virus, like blaster/sasser, just hit the net the time is shorter. When it is relatively quiet on the virus front it will take longer.

This article speaks of malware, that means ALL harmfull stuff. Not only viruses, but also worms, trojans, spyware, adware and such. When do people go on the net unprotected? Mostly after a clean installation. What is one of the first things people do? Download and install their favorite software like p2p applications. That is also a major cause of infected systems.

Although a system can be protected before going on the net, the protection will always fail if the user don’t use his common sense and do not read and think before doing something.