High peaks - California flake

Anything special I should know about this route beyond what's in the new ADK guidebook?
How long does it take to dry after
a good rain?
Worth crashing in a lean-to the night before?

Looking at the new guidebook description nothing jumps out as something you should know that's not in there. Rap from the top of P3 with one rope, if you're going above that you'll need two, and the tree anchors are reportedly sketchy. Some of the fixed pins on P1 are really manky.

I won't make a definitive statement on how quickly it dries but I've climbed California Flake only a couple of days after heavy rain it it was totally dry then. Take it for what it's worth.

My advice: do the classic first two pitches, rap with one rope and do something else while you're back there. As far as crashing in a lean-to, I've always done day trips. There are good campsites at the south end of the lake. Avalanche Camp lean-to is not really close enough to justify camping there for me.