Historically that's what I did. When I began going to the Iron Blosam Week as a guest I flew out Friday and came home Tuesday because the timeshare week started Saturday night. There were also a couple of years when I went for the back end of the timeshare, flying out Wednesday and coming home Sunday. Once I became a timeshare owner in 2009, I went for the entire week. From SoCal I drive to Utah if it's a whole week, especially since I'm usually hauling at least a case of wine.
This surprises me, since on bad weather days in the Alps it's hard to see. Plus so much terrain, including everything off-piste, won't be open. I'll bet a lot of those days are ski a couple of hours, decide the weather isn't going to improve and then spend the rest of the day at a gourmet lunch or doing something else.
Absolutely. 4 days is about the limit that I could push hard every day on Alta/Snowbird type terrain, even with good conditions. On the one week trips I usually need to dial it back a couple of days and cruise around more. Now that I'm retired there's definitely less incentive to ski hard every day. The main reflection of this is taking a drive day between areas on road trips. While I was working I would be more likely to ski to mid-afternoon, then get on the road to the next place.