"If it is worthwhile PRing a 4 page text, then i'm figuring that it is not a necessity to wait 20 minutes before activation."
Ah, yes. After you get the hang of photoreading, you no longer have to let it incubate for 20 minutes; you can go straight to activating.
But when you start out, it's better to let it incubate overnight. After you get decent at it, drop down to the minimum 20 minutes, and after you have the system completely down, you can get rid of the incubation period altogether.
So you're right for now; at first, PRing 4 pages isn't worth it. After you get better, it's perfectly fine (kinda odd isn't it, that you have to get better at 250 pages before you can do 4
).
-Ramon http://razor.ramon.com