Su Mo swallowed hard, forcing himself to go on, and immediately a feeling beyond description surged into his brain.
He grimaced, this feeling was ten thousand times more intense than a burning ice.
"Endure it well, you can come out after three hours. Once out, rest for a while, do some physical training, and then continue with the anti-pollution training."
The old man arranged the next round of training like a cold machine.
Su Mo endured the pain and responded.
"No problem, but may I ask a question?"
"Ask."
The old man replied patiently, just like a very responsible mentor at this moment.
"How long did I last just now?"
"Thirty-seven minutes and twelve seconds, barely passed, but it's not enough."
"How long is enough?"
"When you can hold on for an hour, it's moderately successful, two hours is pretty good, three hours is outstanding, and fully mastering it would be best."
The old man directly laid out the standards and expectations.
