After a year of using PRing you should be quite proficient (otherwise you'd quit ). There would, of course, be room for improvement, but you'd most likely be improving your skill versus building it (as you are in the beginning).

Margaret hit the target with this:
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PhRing is not about activating the WHOLE of anything. The premis is 20% of all material carries 80% of the meaning. You are always shooting for that particular 20%.
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What this really means is that you will not know every single word from that encyclopedia, but you will know (maybe even before activation) what you're most interested in. You WILL know/understand info which would get your attention if you were to read encyclopedia now, in a regular manner. Your brain filters and classifies info somehow, and it makes the most interesting (to you) info and makes it most available to you.

If you would be dying for info (in a positive way ) from that encyclopedia, you'd know almost everything after activation. Since, no one is so interested in whole book, no one (or should I say rare people) can activate what they're not so interested in. So, if you're realy interested in 20% of info (which is usualy true) that's what you get after activation. If you're interested in 50% that's what you'll get. If you're not interested, and PRing just to 'practice' than you'll get (close to) nothing.

Bottom line is: PR helps you learn what you're interested in much faster. Your brain is smart enough to recognize imortant and interesting info. That is why you (and every PR beginner) should start with books you're interested in.

This is my opinion. Since I'm not proficient photoreader I might not be right, although I'm quite sure I am.