Isaac had originally planned to modify his hands much later. He'd expected his first modification to be a third eye on his forehead. But unfortunately, plans can't keep up with change. The war in the Itra Kingdom showed no signs of ending soon, and he couldn't afford to waste that much time.
After all, each body modification had a cooldown period, just like the promotion rituals for Official Wizards. Furthermore, it affected both the body and one's Magic Power, meaning the recovery period was longer and the effects harder to stabilize.
Therefore, even if all his training during the Grand Wizard stage went perfectly, it would still take at least a year or two—a stark contrast to the rapid advancement of an Official Wizard.
