Well, my dd 9 did great with the longer chapter that was her assignment. Dd 8, when I checked on her after 15 - 20 minutes was 1 page away from finishing her book! We had set up her schedule to read 1 chapter a day for the first 5 days and she just whipped through it! I set her up thinking to start slowly since she doesn't typically love reading time, but she flipped that expectation on it's head! She's always asking "can I be done reading now?" She has typically read similar books at the one chapter a day pace.
So, my question... Should I have her re-read the same book to go through it more slowly and do the workbook pages and projects for each day, (which I would imagine would help her get more out of the book) or should we pick a new book to continue on as if we were starting again?
Also, my dd 9 went to bed tonight and read 2 more chapters of her book (again, scheduled to read 1 chapter a day). Am I supposed to keep the DITHOR books only for during that reading time and they should have other books to read at other times of the day? It seems that the whole point of DITHOR is to slow down and digest books, but my girls are too excited to go slow I guess. what a problem...
And only allow them to read what's scheduled. It really does work better this way as they get to think on the book for longer. 
I let my kids plow through other books in their free time, but their DITHOR or Emerging Readers are off limits! Or if they've already done a book for DITHOR or the Emerging Readers and we're done, they can pick it up and re-read it for fun at any time.
Kathleen