50 years is basically enough.
It takes 10 years to learn something superficial, 20 years to learn some basics, 30 years to learn some knowledge, 40 years to sum up experience, and 50 years to become a master.
It will take at least 200 years to learn all Yi Xue, because there are too many sects, such as divination, horoscopes, Feng Shui, palmistry, Qi Men Dun Jia, Yi Lin, word test, She Fu, Yi Counting of Plum Blossoms, etc. wait.