100 years of cultivation to become a demon, 1000 to become Buddha. But Ling Xiao was no saint, so 100 years would suffice.
How would Ling Xiao cultivate? By throwing shade at those who were an eyesore, trampling on those who dared to slander him, and beating up anyone with the idea of walking all over him!
Ling Xiao believed in a simple philosophy: Whoever dared to compete with him over women and money deserved death!