It was not an easy task to complete. No one can do this, especially when the planet has yet to awaken properly. In an awakened world, magic energy would be available for its residents making it easier to awaken or progress their ranks.
Chris didn't have that but he was much in a hurry. So he had to meditate perfectly and long enough to achieve such a result.
His mana core has progressed to the peak of F-rank. All he needed was a push for him to enter the E-rank, but such a task was not easy.
He reached the peak in such a short time due to his high luck and high-quality meditation technique. If not for them, he would have failed to do so. Even with them, he needed the last push to enter the E-rank and the reason why he returned to Aredia after a month-long hiatus.
