It doesn't matter if it's college level material, because if you've learned everything from the previous levels, it should still take roughly the same amount of time, more or less by little.
Activating math techniques is a little different than normal activation, mostly because much around all concepts of math take practice. When you're activating a textbook, it's ideal to activate by chapter, and not by trying to do the ENTIRE textbook at once. Treat each chapter as a book within itself, going from the core ideas, to the step-by-step process of solving a problem.
One thing you may want to do, during a preview of the entire textbook for instance, is go through and try to find what would likely be the most important basic concepts, and think about how they relate to all of the other chapters. You'll find that most subjected textbooks have some basic functions, especially in math, that govern the rest of the concepts.
Then, go chapter, by chapter. I can activate a chapter in 45 minutes, but the textbook would take me more like anywhere from 12-38 hours. It all depends on a number of factors how long it will take for you in the end. So, once you've built the core concepts, then try out solving a few problems. Check your work, and see if everything makes sense. Try to understand not just what you're supposed to do to solve the problem, but what is being done. This applies to not just PhotoReading, but learning math in general. You want to understand what is happening, and why it is happening. If you learn this with the most important concepts, then the rest should be completely easy.
Try spending a little of your activation time understanding what is happening, and what the steps are, and then spend the last of it working out problems to build those neural pathways. 
-youngprer
geocities.com/doc5587
