0 unless you count wandering around my friend's backyard with my camera and helping them set up some pvc tubes and a drop in for them to ski on, because I couldn't acquire my skis at the time.
At college in LA writting term papers. failed hard at making a jib set up on a hill. Bought a bunch of green shit at home depo and used a friends skate rail but could get any speed. spent 2 days for nothing