About 4 minutes. I know you aren't supposed to lift the pen but I did. Once I looked at the drawing I stopped which is why I didn't use the full 5 minutes. In case you can't tell, it's a baseball cap.
1 go outside
2 close eyes
3 walk a bit (safely)
4 open eyes
5 quickly draw first thing that catches your eye. Don't spend more than a minute.
6 while not done goto 2