In the end, Leon only managed to relax for a few hours. Although his body wanted to relax after training for so long, his instincts were telling him to continue because his enemies were getting stronger much faster than him. So, when the mana liquid ended, Leon got up and then walked toward the Ilyana's castle.
Things were going well on Earth, according to Ilyana, his friends were building their new homes and also making use of the time dilation... things were going well, perhaps too well and that kind of thing was what bothered Leon most.
"I guess so many things happened so fast in the past that I got used to it to the point where I miss troublesome situations for me to solve..."
Regardless, after walking for two hours, Leon reached Ilyana's castle, and after half an hour, he found her in the center of the empty building. As always, she was sitting cross-legged and creating Ghost-Swords.