Blink of an eye

Wow, research has shown that web users judge sites in the blink of an eye.
Potential readers can make snap decisions in just 50 milliseconds.
That is, users were shown a screenshot in just 50 milliseconds, and then they had to rank them.
These results were then compared with the regular ranking of the sites.
http://www.nature.com/news/2006/060109/full/060109-13.html