I'm afraid I have not had the privilege of observing Yang Zheng Duo or Yang Jun performing the form, although I have Yang Zhen Duo's superb book, 'Yang Style Taijiquan'. From this book, I have realised that the Tai Chi I have learned from a (Chinese)Master in London is almost identical to the form of Yang Zheng Duo in almost every particular, and that the few very small variations are accounted for by slight differences in the execution of applications. However, of course, what I can't tell is how fast Yang Zheng Duo or Yang Jun do the Form. Of course, I could buy the video, but it takes a long time to arrive from America, and besides, I am rather impecunious at present! Really, out of curiosity more than anything else - but it's a serious curiosity - I would very much like to know HOW LONG the form takes when performed by Yang Zheng Duo or Yang Jun. The Master from whom I learned takes almost exactly 23 minutes. I would very much appreciate information on this subject from pupils/students/disciples, etc., of the Yangs. Kind regards, Simon.