Fairy of All Illusions

In his previous life, Shen Jingzhou was a genius who was tortured to death by Mathematical Olympiad questions. Unable to solve a problem, he worked on it until three o'clock in the morning, and finally lay down on the table to rest. When he opened his eyes again, he saw the beams of the thatched house above his head, and the sound of Lanxi River in his ears. He traveled to Liyou Continent, a world where immortal cultivators and monsters coexisted. Born in a small village outside Lanxi City during the prosperous Zhou Dynasty, his parents were both out-and-out farmers. Shen Jingzhou originally planned to be an ordinary person in this life, farming the land, basking in the sun, and making up for the sleep he didn't get enough in his previous life. But when he was twelve years old, he broke into a chase on Xieyang Mountain - the deposed prince of the Shuoxuan Dynasty was cornered by a demon tiger. Before his death, a cold mark was carved on his heart, leaving behind the words "A hundred years later, the heart will freeze into ice." The key to unlocking the seal is in the hands of the great elder of the Shuoxuan Dynasty, a magical weapon called the Yin-Yang Mirror. A low-level qualification at the first level of Qi Refining was tied to a one-way ticket to the Demonic Cultivator Dynasty. He has poor qualifications, mixed spiritual roots, and meridians as thin as uncooked noodles. My brother-in-law said that he had worked hard all his life to build the foundation. But Shen Jingzhou has a problem - his axis. In his previous life, he used up energy until three o'clock in the morning to solve a Mathematical Olympiad problem. In this life, he is just trying to survive. How long can he use up his energy?