Photoreading the dictionary that comes with the homestudy course..I have been able to photoread it completely easily within five minutes...I think it comes down to practice and getting comfortable with the whole process.

Many of the books that I am PRing at the moment are 700-100+ pages long. I have found that it really depends on the state that I am in as to whether I PR a book in one sitting or PR the book in chunks. i would suggest that you notice what your body is telling you. If you get tired or loose concentration, stop, do something differnt and then come back and renew your efforts with vigour! I have also found that with practice, you can get quicker and quicker at the turning the pages of a book whist remaining in your own best state, naturally you'll zip through the books faster.