How long is it appropriate to play a set of Yang Style Traditional Taijiquan 85?

Half an hour.

Basic Criteria for Judging Taijiquan

First of all, it is a special technique. Taijiquan is a boxing, not a drill, not a dance, so although it does not advocate "martial arts" but can be "martial arts", is a "literary boxing", and this martial arts is different from some of the "hard hitting and hard advancing". And this kind of martial arts is different from some "hard hitting and hard entering" martial arts, attaches great importance to "softness to conquer hardness", and emphasizes "sticking together and following" and "surrendering oneself to others", which is a kind of extremely high-level This is a very high level of skill.