Hi,
Could you tell us exactly which course you're talking about? There is now a PhotoReading Results Supercharger, which elaborates on and provides additional insights into the PhotoReading process. It becomes useful only after you have familiarised yourself with PhotoReading. I suggest you play with the PhotoReading course first and see how you adapt it. When you feel comfortable enough with the material and are ready to progress, the Supercharger will be a great way to do that. There is no fixed time span. Everyone learns at there own rate.
KWLee