How long will the BFB take and how do you know when it is complete? Does it beep or somehow signal it is finished?

By default, BFB scan will save 10 frequencies most suitable for you. And One frequency runs for three minutes, so running a biofeedback scan result would take 30 minutes. You can set an alarm on your phone so that it alerts you when the run is over. For doing BFB scan with scalar, it takes about 30 minutes, and it will beep at the end. Hope this information will help you.