How long can you give job talks on your thesis-book project? I'm two years out of my PhD in the humanities and have given a couple of job talks since, all on material from my dissertation.  Not only have I spent months trying to make the talks themselves as good as possible, they're based on ideas and material I've had the entirety of my PhD to feel confident about presenting.  My question is: at what point on the market do universities expect you to present new material that's not part of your dissertation research?  I'm at the very early stages of developing my "second book project," but my research / argument aren't nearly as developed!
I’m in a vastly different field, but if your work is progressing at approximately the same rate as your community’s then I wouldn’t worry about it. 

Perhaps you can talk about your ongoing work as well just to signal that you’re not stagnant. The point of the job talk is to assure the department that you’re going to do good work while there!