If you are going to zap. Do it to the extreme, after you work up to long sessions.. Start at 15 minutes a day. And add time each week, Eventually you want to zap overnight both wrist-to-wrist and ankle-to-ankle, at or near full power with two of the Dr. Beck designed devices. Place the electrodes over the arteries correctly. Then you are zapping the whole blood supply several times over. Forget about the one wrist technique. If you do it make sure you are zapping the entire blood supply may times over.