For those who have experienced A&P, do you often experience a bodily sensation and then feel many successive throbbing or pulsation at that spot. I noticed this happening now and then and happening  at different parts of body. 

I know there is no hard number but is A&P something one may stay in for months to a year? Typically, of course it varies. Tell me how long you have been through is a better question.

Thanks in advance on your rreply.

I started to experience AP vibrations after ~90 hours of noting practice (multiple hours per day). They subsided now because I stopped practicing, so I don't experience AP phenomena now.

You mind if I ask why you stopped practicing instead of moving into the Dark Knights and into Fruition?

I had a psychotic episode and had to stop. I restarted my practice now. I forgot to mention I meditated for 2 hrs/day for around a year before the 90 hrs marathon.