三年

Three years

You can plunder life essence by killing demons, and 1 life essence is equivalent to ten days of hard training.
"Jiang Daoming, you are cruel, and 325 demons died without a complete body. You are too murderous, and you are about to go astray."
"Demons should be killed!"
"Send you to Qingxin Cottage to eliminate the evil spirit. When will you suppress the murderous intention, see your true nature, and become a formal member of the Demon Exorcist Hall? Do you have any objections?"
"No."
"I hope you can come out soon and become a formal demon exorcist to kill demons and exorcise demons."
So, Jiang Daoming lived in Qingxin Cottage for three years...
Three years later.
"The sinner I want to kill, even the Emperor of Daxia can't keep him, I said!"