This closed-door cultivation will not end in just a couple of hundred years; it will require at least hundreds of thousands, or even millions, of years.
Otherwise, he would not have invited numerous ancient ancestors to help, going to great lengths to construct such a place for seclusion in the Chaos Sea.
Bai Nian, on the path of cultivation, has ordinary talent that is not outstanding, and since he is not a native living creature within the Cave Heaven World, he previously failed to benefit from several cosmic changes triggered by Chu Zheng's cultivation progress.
To this day, his cultivation has merely reached the Fifth Order.
The historian lineage focuses more on nurturing and strengthening one's foundation, with ordinary combat prowess but comparatively longer lifespans than typical Taoist orthodoxy, though even these have limits.