My dad showed me this in an email. Its supposed to be a test for Air Force fighter pilots, they are expected to go for over 2 minutes continuously. Normal people are considered brilliant once they reach 18 seconds.

http://members.iinet.net.au/~pontipak/redsquare.html

After 3 trys I got to 10.442
My 5th try was 15.000
6th try was 16.493

Everyone try it and post your times.