I thought I was being pretty cool in Becca by giving four layers of choices (16 endings). When I wanted to go all daring with an opening triple choice with Lauren, I lowered it to three layers (12 endings). Then in Charlotte I got wonky and abandoned symmetrical choice patterns for whatever I could stuff in, but it still ended up no deeper than four layers (11 endings).
I'm a total lightweight! Take a gander at this analysis. You need to go there because it's interactive. First of all, it is so cool a fan mapped this out, even if it was for English class. (There's also a matching essay.) Second of all, this is what it takes to go from 11 rather character-driven endings to 40 plot-driven ones. I really, really, really want to write something this insane. Just to see if I can.
The last cool thing about Mr. Lord's work is a categorization of the choices. I wrote about my own choice categories back in January. My list of choice types is mostly the same.