Hearing this, Kakashi Hatake instantly recalled the scenes from the Fourth Shinobi World War.
If Naruto Uzumaki had not shared the Nine-Tails' chakra with the Allied Shinobi Forces back then, the casualties would have been more than several times higher.
Naruto had been able to do that back then, let alone now.
"If I could train with Naruto's chakra supporting me..."
Sasuke continued, "Once my chakra runs out, I wouldn't have to stop and wait half a day to recover. I could keep trying. Every extra attempt would mean another chance of success."
"What would originally take three months might be shortened to one month, or even less."
Kakashi nodded.
The logic made sense.
What everyone lacked now was time.
With Naruto's help, Sasuke could make multiple attempts to open a Space-Time Portal in a single day.
Once he became thoroughly familiar with it, he would definitely be able to complete his training in the shortest time possible.
"With Naruto supplying chakra, I could reduce my recovery time to two-thirds."
Sasuke said, "As long as the chakra keeps coming, I can maintain my eye power output. A full day of continuous attempts would be more useful than ten days of training on my own."
"All right."
Kakashi nodded. "I'll go tell him right away."
Kakashi turned and walked toward the edge of the woods. After a few steps, he stopped again and turned his head, revealing the eye that was not covered by his forehead protector.
"Sasuke."
"Yeah."
"Don't push yourself too hard. If you collapse, none of this will mean anything."
Sasuke did not turn around.
"I know."
Kakashi watched him for two seconds, then turned and walked into the shadows of the woods. His footsteps gradually faded away.
By the time Kakashi returned to the Hokage Building, it