Although it wasn't very comfortable, they flew without stopping. Leon was already used to staying awake for a few days straight. However, Betty and Sasha had to take turns while keeping an eye on things since Leon was concentrated in moving the earth platform and trying to think of a way to regenerate his limbs.
In the end, Leon had a hard time thinking about it. He could heal wounds, but the wound on his shoulder was already healed, there was nothing to heal left. Leon tried to make his arm using mana and tried to stimulate the mana, but nothing happened. That would be very hard... if he couldn't heal, the only way to regrow his arm was to multiplicate his cells. Heal repaired dead cells... so he had to learn the method to heal a cell so much that one would become two cells.
"That sounds somewhat unpleasant... I feel like if I make a mistake, I will end up creating a monster copy of myself..."