Before he returned to rage tide city, Shen lang went to the lost Country ruins, the pyramid at the top of the snow Mountain. He wanted to experience the Dragon's enlightenment again because he had indeed come too early the last time.
Shen lang had always had a misconception. He thought that he had to go through the Dragon enlightenment first before looking for the Dragon. However, that was not the case at all. His father, Jiang Li, had already completed the Dragon's contract, and Shen lang only had to renew it. He did not need the Dragon enlightenment at all.
On the other hand, if Shen lang spent some time with the Dragon before he tried to comprehend it, the effect would be better and he would have a deeper understanding. This kind of Dragon enlightenment is completely dependent on your own understanding and wisdom at the time. When you feel that you've reached a dead end and can't comprehend anything new, it will automatically stop.