With Joshua and Akhar's ability, it would not be difficult for them to keep fighting for ten days and nights. There were countless lifeforce constructs similar to high-performance engines within the warrior's border that spontaneously absorb all energies adrift around the warrior, while the knight used the celestial power from the land below his feet—the energy reservoirs were essentially endless.
The power they possessed in their threshold, their incredible regeneration prowess as well as that combat pattern where they attack and parry on different occasions, it would be days or months before the victor was decided.