C547 Kusanagi's Exhortation(part I)

Soong Yuanqiao explained, "One thing is clear, if I am to practice the Nine Palace Eight Trigram Formation with your Martial Uncles, then in order to activate this formation, each of us must have at least 20 years of internal energy.

This is the standard of internal energy. In other words, the six of us would need at least a hundred and twenty years of internal energy to drive the formation