Magnus Bjelland skied the Cosmiques couloir (Tue. 06.03.12 near Aiguille du Midi) in great conditions. There are three twenty five meter rappells at the top of the couloir. Since the snow was almost perfect, he managed to get to the skiing with just two rappells. High winds at the top resulted in hard packed snow, but the snow further down/above the glacier was sometimes knee deep!
The whole couloir, with rappells, takes approximately 15-25 minutes, depending on the conditions :)