Study: Unpatched PCs compromised in 20 minutes

According to the researchers, an unpatched Windows PC connected to the Internet will last for only about 20 minutes before it's compromised by malware, on average. That figure is down from around 40 minutes, the group's estimate in 2003.

The Internet Storm Center, which is part of the SANS Institute, calculated the 20-minute "survival time" by listening on vacant Internet Protocol addresses and timing the frequency of reports received there