120 meters. I figured out a good strategy.

My first strategy was to just be as steady as possible and give a nudge or push when I need to in the right direction. That got me up to around 40 to 50 meters.

Then I changed strategies. You move quickly the mouse back and forth about 1 to 4 times per second spanning about the width of the whole game window, so that the guy actually looks like he's walking drunk, and there is definitely no stability. For some reason I can get much further this way, usually 40 being the minimum, and 120 being my record after 8 minutes of playing.