That was a massive hurdle. He did not know how to overcome it. He definitely did not have the time to wait hundreds of millions of years.
But Grey was absolutely not going to lose hope this easily.
The Thought-Demolishing Channel he had first obtained was a frequency. The fact that he could physically comprehend it was the ultimate proof it could be done.
It was already theoretically possible with gamma rays; it would just take until the literal end of the universe for the entire conversion process to finish.
What he desperately needed was to safely reach that state of frequency in the shortest amount of time possible.
Reaching it through normal means was naturally going to be incredibly hard. He was trying to violently reduce a timeline of billions of years down to a month at maximum.
