Wow,
This seems to be a hot topic - just thought I'd put my two pennies worth in aswell.
I have not been practising photoreading as often as I would like and have lapsed somewhat, but I do remember some months ago wanting to read up on Mind Maps. I knew I had photoread the book a couple of times, but probably over 12 months previously.
Either by sheer fluke or perhaps more likely from photoreading I decided on a particular area and turned to the exact chapter where I needed to gain the information. That was one of those WOW experiences that many of the newer photoreaders experience.
So basically what I am saying is that it does not appear to matter how long you leave it before you again need to access certain information, subconsiously it is always available - it just takes that little nudge to bring it up to the surface again.
Hope this helps. 
Fraser
