Supposedly not. Once is enuff.
However, i have noticed that if i PhR a book a few times, i consciously start to just feel like i know it. Then when i activate it, i move very quickly thru it.
Another thing i've noticed is that it's very easy to go back to review a book. I'll PhR it again & the review takes very little time.
I have basically improved my intuition by only PhRing intuition books before going to sleep. One day i just noticed a total shift in my perspective.