Never done but talked to some folks on the lift about it, sounds proper insane. I think there's one run that's the fastest descent and if you are competitive you just have to ski that same line every lap for like, what, 30 to 50 laps? Psycho
this sounds fun, yet dangerous, skiing physically tired and trying to beat the clock=not great combo. I would give it a shot. See how long you can REALLY ski for.