Tang Shaoyang thought opening his meridian would be easier with his unlimited internal energy supply. The key to opening the meridian was the internal energy. To keep circulating the internal energy through the meridian, you need enough internal energy.
It was a slow process for many people because they had limited internal energy, but it was different for him, who had almost unlimited internal energy thanks to his Chaos Energy. He could keep going for a month until he opened all meridians, which was his plan.
Each circulation helped him expand his meridian, meaning his meridian could contain more internal energy, which helped him to open the next pathway.
It was smooth at first; he easily opened his meridian after his previous attempt when he first got the Grandmaster Codex. One after another pathway opened as the converted Heavenly Energy was so pure compared to the internal energy in his dantian.
