The Stone Ocean manga has a considerable length. It consists of multiple volumes and chapters, but the exact number can vary depending on the specific edition or publication.
Perhaps they would start off as strangers and then become friends through a shared struggle. For example, they might both be targeted by a new and dangerous enemy. As they fight side by side, they start to understand each other's motives and values. Giorno might learn from Joseph's years of combat experience, while Joseph could be inspired by Giorno's fresh perspective and determination. They could also have some humorous exchanges, with Joseph making jokes and Giorno having a more deadpan reaction.