Hi,
I stay aware of the primary energy point on the front, bottom of the foot , too, while bouncing. The bubbling spring, kidney point, or whatever one call's it. Feeling the bottom of your feetnice and open, energetically, and being aware of that point. I don't focus there, just an awareness of it being there ... It is within the whole of what you are doing. Bouncing up and down on the heel, is very different, and remember the caution to how hard you do that, if you have , say a sensitive back.
Ozzie, regarding you question to me,,,,You know when you are done, because you feel when you are done, or see it. The seeing part can simply be your intention and that visualized. this leads the energy in the way, you see it. You focus your intention, and see it coming out. Your imagination if that suits you better for a term to use. You trust that intention, and how you choose to see it. Don't let doubt in, or an elongated double doing of things , due to doubts about it. Be confident, you are a master doing the work. Do it like you are the master you are. There is no set time or numbers. You make everything happen through your intention and visualizations, as you express the SFQ techniques you learned. Again, your mind is moving the energy. It is how you see it, so, see it in a good and effective way! Lead the energy the way you want it to go. Whatever you do, three grabs, two, a variety,,,,focus, on seeing it gone, or coming out, etc. when you envision that, it is done, move on.
love,
gallen