Immersed
The total number of projects that he was undertaking was increasing dramatically. Not only was he taking on four domain techniques that each was difficult and elaborate enough, but now he was taking on two more sets of thought techniques.
He was working on more projects simultaneously than he had ever worked on in his life. That was why his progress with each one of them was miniscule.
Especially Project Reverse Prophet. This project became a scary titan that threatened to cause him failure.
Regardless, he strived through. Months passed as he continued working on them, mostly meditating or working on his heaven and earth bending while he worked.