>http://www.online-stopwatch.com/Use the tab key to select "start," then press space to turn it on as soon as you see the communications screen come up. You'll want to have the 3DS turning off at about 4.5 seconds.
Get a sense of your reaction time. You're not going to be starting the timer at 0 seconds exactly, since it will take you a fraction of a second to press space. Additionally, the same is true for when you're turning it off. Take into account what adjustment you'll have to make to your timing based on that.
Oh, and of course, you'll want to always make sure to
_____________git gud. 
