The process to upgrade the Space-time Judgement Sword was slow from a general perspective, but in fact, it was far quicker than it should be upgrading a sword of that level.
If Yale was conscious, he would just upgrade it a bit and wouldn't dare to do great changes but while in his enlightenment state, he had no restriction.
The materials of the sword were unable to keep up with the upgrade process, so the sword should break at any moment, or at least that was what common sense said.
However, Yale managed to find a perfect balance to increase the resilience of the sword each time the materials reached the limit. It was a work that should be done in milliseconds despite being a lot of factors to take into consideration when doing it.
The only ways to accomplish something like that was being like Yale, in enlightenment state with the Celestial Knowledge activated or by being used enough to the process being done unconsciously.
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