I used to do that drive every other week back in the late 90’s early 2000’s. Very peaceful indeed, especially on a weekday! I do not recall it taking 4 hours though (my bad memory) and the back side is awesome if you know where the cattle guards are
;-)
I have some good snow pics of my old 300z while at the top and some ok shots of the twisties somewhere… I’ll have to dig those up and post them.