Rowan's perception that he had released inside the living universe spent tens of thousands of years understanding the mind of every living being in the macrocosm, but due to the fact that the spell had frozen time inside the universe, his consciousness inside the universe felt that it was experiencing time go by.
The consciousness could still roam inside the frozen universe, going from soul to soul, scouring every consciousness inside of this space, while time had not really passed.
It was a rather interesting phenomenon that allowed Rowan to experience the mysterious nature of time and how its actions were sometimes dictated by the perception of the individual experiencing it.
To everyone in the frozen universe, they did not know that time had been stopped, even if Rowan maintained this spell for another billion years, to them, not a single second would pass. The moment he lifted the spell, they would all continue with their lives not knowing that so much had changed.