Maybe this’ll help. BaGuaZhang ("8 Trigrams Palm) is a martial art founded (probably) by Dong Hai Chuan around 200 years ago, a culmination of Daoist Circle Walking exercises and various martial arts. Dong Hai Chuan only accepted students with extensive martail arts backgrounds, which is why there are so many different branches of the system. Theoretically, the system is based on the 8 principles/phases of changes in all nature, as described in the ancient Chinese classic, the ‘Yi Jing’ (“Book of Changes”). A primary distinction of BaGua from other systems is it’s extreme emphasis on circular/spherical movement, body-coiling, & centrifugal force.
1: All BaGua systems utilize forms to develop Principles of movement/Intent/Feeling (Jin/Jir). Most BaGua branches teach a series of 8 short forms, called “Palm Changes”, usually linked together in one long form called the “8 Mother Palms” (Ba Mu Zhang). Each of these short forms/palm changes are rooted in Dan Huan Zhang (single palm change) and Zhuan Huan Zhang (double palm change); other palm changes are variations of these short forms. Many BaGua branches have more basic forms before the 8 Mother Palms are taught, some branches have more advanced forms, and some (the rarest and best) branches even offer various levels of technical complexity of each of thier own basic 8 palm changes.
2: By “techniques”, I’m guessing you mean applications? There are no fixed number of applications in BaGua, since the system is based on continiously adapting to change, and transforming attack to counter attack. There is more emphasis on Principles of movement than postures or specific technique, more emphasis on methods of stepping than fixed stances. Dong Hai Chuan would only accept students with extensive previous training, so that such basics of stance & technique are already instinctual.
3: Previous posters, & the book you reference, mention ‘Rou Shou’ (“Soft Hands”), while my instructor called the practice ‘Zhou Shou’ (“Search Hands”), a free form drill to develop sensitivity, and continuity in application. Before ‘Zhou Shou’ is taught, a student is first introduced to set-pattern drills such as DanTuiShou (“Single Push Hands”), ZhuanTuiShou (“DoublePushHands”), Da Lun (“Big Wheel”, a double push hands drill with more variation/changes), and Chan Shou (“Wrapping Hands”). Zhou Shou is similar to “Randori” practice in Jujutsu/Akikijutsu, where applications/counters are practiced continuously in progressive levels, depending on the skill levels of the students.
4: Different branches and teachers of BaGua know/teach different weapons, each branch with it’s distinct usage/forms. Staff, Spear, Sabre (broadsword), Sword, Needles, etc., often taught while walking a circle, but not always. A weapon mostly unique to BaGua is a paired weapon called Yuan Yang Yue (“Elk Horn Daggers”).
5: How Long? Totally relative to how bright/talented the student is, and how knowledgeable/skilled the teacher is. At it’s roots, BaGua’s a very diverse system with incalculable depth. Finding a Ba Gua teacher is hard enough, finding an authentic, skilled practitioner is extremely rare. Most skilled practicioners are protective and reluctant to share the real, practical core of the system–if they do teach at all, it is often just an empty shell (forms) they exhibit. Which is why authentic, practical, useful BaGua is on the brink of extinction. Keep training hard, and keep searching! 