The duration of my exercise was 30 minutes. The first 15 minutes I sat in Padmasana (Full Lotus Pose), but because I usually never exceed 10 minutes in that pose, by minute 15 my ankles were aching, so I just switched to Half Lotus and sat that way for the next 15 minutes. I might try and sit in Seiza, instead, because I associate Padmasana with Yoga, and to me Seiza makes much more sense for someone practicing Qigong. However, Kouji, if you have any clarification on this I would highly appreciate it. Anyway, It was easy to keep concentration on my object for the first 20 minutes, for the most part, with only a few glitches here and there. I've always had problems emptying my mind, but I am absolutely determined to master this technique. I believe the Tao Te Jing says it best, "When the mind is still, all things under Heaven fall into place". This concept made sense to me around the 15-20 minute mark, when for a couple minutes, my mind was almost perfectly still, and my sense of time seemed to vanish a little bit. As I inhaled, I could feel hot water spreading from my Middle Dantien, and through my body. Then I started thinking about those feelings, and at that point the experience ended and my active mind started to race again. The last 10 minutes were hard for me as a result, as I often drifted to thought instead of focusing on my exercise. I'm excited to try this again and get good at it.