11 hours ago, I just finished my binge of this series (from start to finish) and didn't realise all these small cliffhangers.
But with the release of this chapter it dawned on me... :meguuusad:
I agree with @BraveHeartedHero. Furthermore I'd say: yes 100 Million Years (or rather 200 Million) is far too unnecessarily long a time span for various reasons, except maybe for he'd be way more OP.
I'd argue that he alone would not be able to master swordsmanship technique or any other...