How many chapters are Ningchen and Xu Shuyan together?

according to the story of the novel "I have cultivated immortality, but I still have to study", it is known that the story of chapter 255 is that Ning Chen successfully confirms her relationship with Xu Shuyan. The author is Ao Shi Long Shao, created in 219.

The plot of the novel: Ningchen travels in the summer vacation, strays into the transmission array that opens once every two thousand years, and accidentally crosses into the realm of fixing the truth. When I came back after I was a baby, I thought that the earth had already changed, but I didn't expect it to be a summer vacation ... So, a baby Johnson was ushered in this freshman of Qingzhou University. "You don't know anything about the power of monks in Yuan Babies."