Noah's period inside the separate dimension wasn't as harsh as many others, but he had his fair share of difficulties too.
As soon as the battle against King Elbas ended, Noah's centers of power suffered from Sword Saint's final technique's downsides.
Noah's life had never been in danger, but he had to rest for a while and let his centers of power recover from that strain. After all, he wasn't on a level where he could perform that type of attack. He had to rely on his ambition to express a prowess beyond his limits.
After he recovered, he handled the messy situation inside the separate dimension.
There were three organizations and countless cultivators to manage. Noah had to invent a social system that could force those assets to survive together without endangering their overall strength.