The number of JoJo mangas can be a bit hard to pin down precisely. There are the main series volumes, along with special editions and related works. But you can expect a substantial collection over the years.
The length of the JoJo manga varies depending on which part you consider. Some parts are shorter, while others are more extensive. In total, it's a substantial body of work that has captured fans' attention for years.
The concept has a significant impact on the JoJo fandom. Firstly, it deepens the connection between fans and the characters. By imagining characters reading fanfiction, fans feel closer to them. Also, it can inspire new trends in fanfiction writing. Writers might start creating stories specifically with the idea of a character's reaction in mind, leading to more diverse and interesting fan works. Moreover, it can increase the sense of community as fans share their ideas about characters and fanfiction.
The number of chapters in the JoJo manga is substantial. The series is known for its longevity and rich storytelling. To know the precise count, it's best to refer to official manga listings or comprehensive JoJo fan communities.