Start with few seconds. Increase the brewing time at each following infusion. Exception: If the leaves are pressed, make the first infusion longer than the second. For best results in gongfu cha, brew in a Yixing teapot.
About the producer:
After beginning a career in sports medicine, Shi Kunmu became intrigued by tea production, and specifically pu'er, He established multiple tea companies based in Taiwan that closely cooperate with and source material from mainland Chinese producers, and has become known as an expert in the pu'er world, publishing several books and continuing to produce pu'er for his company, Shi Kunmu Classic Tea Culture.