Late at night, An Jing was practicing the Son of Heaven Art.
After days of day-and-night unremitting meditation and training, the time it took him to enter the state of the Son of Heaven Art had dropped from half an hour to about half a quarter of an hour.
Although it was still quite long, it had reached a level where he could practice introspection whenever he had a spare moment, greatly increasing its practicality.
Chapter 270