Five days. Ou Yangming stayed in the Fang residence's secret room for five days.
When a person's cultivation base arrived at Yin Grade, he or she would undergo enormous changes, one of them being the ability to cultivate essential Qi to replace sleep.
Needless to say, it only applied to some special cases. For instance, if someone had to maintain absolute focus at short notice. During that time, a martial artist could cultivate essential Qi to substitute sleep temporarily.
Ou Yangming was a Yin Grade martial artist, so he could naturally do it.
In actual fact, when he was still in Force Grade, he had completed this step by transforming the flesh and blood of countless quarries into Qi and blood for his own. Now, he was only reaching his goal using another method.
Throughout the five days, Ou Yangming had attached triple-layered Unique Attributes to every piece of equipment.