I have found through my experience that you can photoread as much as you like and have time for. I usually break up my reading in lots of 5 at a time. It's just easier for me to concentrate my attention and intention.
Sleep and exercise are important to incubating the info. How soon will you know it has taken effect will vary. I have one friend who photoread some diet books and actually lost 5 lbs in a week. What he was unaware of at first was that he automatically eliminated a few foods in his diet without even thinking about it.
