1. yes and no. it depends on your purpose and your ultimate application of the book. time is a linear factor in the function of comprehention.
2. yes if you do it efficiently and not over deep. just do it and compare.
3. the 5 day method is very simple: ONLY pr books for 5 days then only read normally books for 5 days. compare the results in understanding, comprehention and ofcourse quantity of books.
4. if ur getting into a big mess with diverging your eyes just use the X method detailed in the book. photofocus is just a signal that you are reading using your whole mind. it is not the thing that makes the difference its only the indicator.
5. look at both pages. personally, at first i tried to open up my sight and notice everything i could. then i've applied it on a book.
just have fun
Raanan Hadar