@NicoleCRust I think I'd take just one "case study" or example that makes the point of the whole book if possible, and go narratively through that example keeping only the essential parts of the argument. If after that I noticed there is still time, I might add a second one, or more likely talk about something that is not in the book: some behind the scenes, stuff that didn't make the cut, how did I decide to write about this, what are the reactions to the book so far, any interviews