My pulmonologist said to set an amount of time, no more than 45 minutes for each session. I used to use AD app but gave up on that and switched to my own AD, which is 4 breath holds instead of 10. A time savings. With AD I use 4 postures, upright, laying flat, and on each side. The morning is the most time consuming. Once I started to focus on where the secretions were in my lungs it became less exhausting. In addition, I use 2 vials of 7% saline and sip hot water or tea with honey throughout as the saline can be irritating. I also pre-treat with albuterol to help make the saline more tolerable as well.