The Frigid Air Buttress is a fun climb, but since it's a Herbst route, it is a little stiffer than the rest of the grades there. Lots of funky wide stuff, and another of his famous 5.9+ cracks. Also, finding the decent is challenging. I would plan on getting to the top well before dark. I wouldn't do the link up until I had a few red rocks epics under my belt.
Finally, no, Mt. Wilson would not qualify in my under 2 hour decent category, but it also does not qualify in the grade IV category either. I thought you were a critical reader Jason?