In reply to David Coley:
I did many years ago. As Robbo writes, snow makes ascents of if slow. Basically the whole fall, is spaced out steps and steeper portions with long walking terrain (often snow) in between.
Completely doable in a day, but it means that simul-solo or just solo on the easier terrain speeds things up considerable. I recall we only pitched for like two pitches and the rest was done as either solo or simul-solo (but no gear between us). After reaching the plateau, a snowslog gets you to the ski-resorts access road... originally people were supposed to come pick us up, but due to other things there were not there... so we ended up walking all the way to Ozzymosis (I think) parking lot). It was a long day, but nothing uber long.
Were I to do it again now, I'd indeed try to do it when there isn't a lot of snow... and perhaps might only carry a ~40m thin single rope for the steeper steps. Pretty much the rest would be just simple solo. This would speed things up a lot, and also make the rucksacks lighter (I recall we had 60m half ropes...)