"If you can go longer than 18 seconds you are phenomenal.
About 10 seconds is the average, How good are you ?
The US Air Force uses this for fighter pilots.
They are expected to go for at least 2 minutes.
Navy guys are only expected to last one minute
Give it a try but be careful...it is addictive!!"
http://members.iinet.net.au/~pontipak/redsquare.html
My best score was 21.015 (https://2img.net/r/ihimizer/img462/1544/test3vg5.jpg)