My T spends between one and two hours preparing for and following up on each therapy session: writing down his notes, reading up on his older notes, looking up relevant research and so on and so forth. (He spends the same amount of time on it even if the client has to cancel a session for any reason - he won't have session notes to write then, but he'll still do all the other stuff.) If I were to bring something in for him to read between sessions, that would be included in that time - I would not expect him to do it in his free time.

That being said, when I have brought things for him to read, he has done so during session time because it has always been things I wanted to discuss in session but had problems talking about. But I could definitely imagine bringing something in for him to read between sessions as well.

In addition to things I have written for him, I once asked him to read part of a txt message conversation on my phone.