After talking with the Emperor-rank pets, he left and went to begin his experiment session.
The contract was strong, but it was established, and hence, he believed he could somehow make changes to the binding within Tavros' soul with his Monsters and break it without killing the Pet Monsters.
It was already the morning of the next day, 11 p.m., so John spent 2 hours in careful experimentation and understanding the technical aspects of the contract that were a bit hard to grasp.
But he didn't need to understand the contract entirely. All he needed to do was to cut that one part in Tavros' contract so that even if he died, his Pet monsters would live.
John got up as he was done. He had decided to spend only 2-3 hours in the experiment daily.
Azelis and Jibril were also done in two hours, as Jibril had successfully created her Spirit Physique and transferred the progress from her body to it.