Ling Han's progress was slow, but that depended on whom he was being compared with.
How many people were capable of breaking through to the Third Tier in just a billion years?
In terms of natural talent in cultivation, Ling Han admitted that he was not the best, but his opportunities and fortunes had surpassed anyone's. For example, could there be a second person who could accommodate the Powers of Dimension of the whole Genesis World inside his body?
With high natural talent, their progress was slightly faster. However, even when it came to the likes of Lin Youlian, the greatest prodigy of all eternity, wasn't she still stuck at the Fourth Tier?
Moreover, even if they could cross over to the next threshold now, the Sixth Tier and Seventh Tier were both huge hurdles, and the time required would be even longer. Furthermore, the Seventh Tier was the end of the line. If Ling Han could also cross over to the Seventh Tier, who could rival him?