It's a slog.... with tons of great descent options.
I climbed the Cassoval Ridge (3/4) then traversed to the West Face and pushed from there. Give yourself 10 hours from camp to summitt, and try to get there at noon (assuming you're looking at a spring-time attempt.)
The West-Face corns up beautifully with about 45 minutes of sun.
I would highly discourage doing the standard, Avalanch Gully route... tons of gumbies, and it will be totally tracked up by 11AM. However, we did see some sick chutes, skier's-right of the main gully route that empty into it. If you time it just right, these lines would be worth the crowd you will encounter at their exits.
I'll be heading up there in May a few times to get these chutes, ride the West face again, and check out Shastina. I'll also be looking for more technical, glaciated routes on the North face.
oh, yeah.... I assumed you mean to ski or snow-board the descent.... it's the only way. don't bother, if your plan is to down-climb. It would be a total waste