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Noah was summoned by one of his clones in Sector D, as he quickly deposited his Divine Realm into the spatial layers and then went inside as well.
The whole fight took around 6 hours, which were more than a day inside the divine realm, but Iris and the rest were still participating in the battle as they had fused their souls with Noah.
When they separated their souls, unlike other times, they didn't felt weakened, it seems that Noah's soul regeneration was now superb, especially because he had been drinking blood with his soul inside of his divine realm through this entire fight.
But which blood? Well, the entire blood ocean he has in his divine realm.