You probably already figured it out but I've hitched around it a couple times, 46 from the south and I wanna say 58 from the north, by way of the 101. There's also the nacimiento-ferguson road, which is windy as fuck and I probably wouldn't hitch it, I had the good luck to get picked up by a guy who was going that way. Wildass ride in an old VW bus that felt like a tin can.
One guy told me he walkedthe slide, he said the folk watched the pass leave at 6.30 and that it was about fifteen miles all told, but don't quote me on that