Once you master the basics of PhotoReading and you are doing the system properly, it is just a matter of time. Results vary from person-to-person, too.
It really boils down to how quickly you can PhotoRead and fully activate as many books as you can get your hands on.
One challenge would be, to find a book that comes with a multiple-choice test at the end.
The time it took for Pete to achieve his speed? I don't know exactly. It was shortly after PhotoReading was created. The PhotoReading process has continued to evolve and improve since then. So, beginners can see results in the shortest amount of time.