Nine days!
Jiang Yi realized a low-tier dao pattern in just nine days. If other people knew his incredible progress, they would be completely shocked.
Realizations were qualitatively different from epiphany. The latter was a flash of an idea, and in an instance, one was suddenly triggered to enter a magical state. Epiphany could only be come across by chance. Even powerful people like the Nine Thearchs could never think about forcing themselves to achieve an epiphany!
For example, Jiang Yi grasped Binding of Wind and Power of Fire dao pattern through epiphany. The time needed for epiphany was very brief. It might be as fast as a few minutes or as long as a few days.
There was an old saying that 'ascending in a single day by an epiphany'. This was used to describe the miraculous part of epiphany.