How long before things are back to normal?

I have belated managed to read the OECD document The Subprime Crisis: Size, Deleveraging and Some Policy Options. It's a little scary.

It could take 6-12 months for banks to offset losses via earnings alone

And that is based on $350B or so of total losses. If the uber-bears are right and it is a trillion, presumably it will take three times longer.