Everyone has their own natural breathing pace which is comfortable for them. The Breath Pacer (Mandala - home page, or the Chaser - screen 2) starts out at a breathing pace using a 10 second cycle - 5 breaths in and 5 out as illustrated below. If you find the speed of the Breath Pacers to be too fast or too slow, just breathe at a steady relaxed pace that is comfortable for you.
If you would like to adjust the breathing pace to your comfort level.
Use this procedure: