I've not hit it, but feel that I know enough to offer something.
The run in has a super flat section, and it seems like you can build the kicker anywhere from 50 feet back to 120. It can take anywhere from 3 hours to about 8 I imagine depending on how gnar you wanna get. Some kids last year built it super tiny in one day. Th, and hit it same day. The avy danger in that area isn't terrible. Grizzly is pretty mellow... faces south, so the snow gets shitty quick, and some wet slides from time to time, but I've never seen anything super intense.