Generally, girls want guys to contribute how many minutes to be satisfied, Luo Yang doesn't know.
However, he knows a beauty that can be used as a reference.
It's none other than Qin Piao.
Qin Piao is a Super Female Warrior that can battle Qie Zi for three hundred rounds.
As for Qin Piao's upper limit of how many minutes she can fight with a guy, that's unknown.
But one thing is certain: among the conditions she set for Luo Yang, there is one that says each time he gives her no less than 30 minutes.
In Luo Yang's view, Qin Piao belongs to the category of beauties with very strong combat power.
So, he guesses that the combat power of an average girl is probably a bit more than half of Qin Piao's, or even if it's just half, that's 15 minutes.
So, it seems girls need around 15 minutes to achieve their desired real enjoyment.