Couldn't give you actual lengths, but here are mine for fun (and may be longest as well):
BWV - I think its the logest with the most turns/change in direction. Don't mind the vomitting clown.
VB - I know its off-site, but you didn't specify. Love the corkscrew on the way down, can get really fast.
BCV/SAB - long and fast, but no curves
OKW - small but dark, fast and twisty.
SSR - A pretty good length with some turns, but not very fast. I expected the newest resort to have a better slide.
HH - short, but surprisingly fast.
VWL/WL - very short, more of a kiddie slide.