Deadline claims that Avatar 2 is expected to be more than three hours long. However, members of the "Avatar 2" crew said that 3 hours is not an accurate number. Because, the film's final release time has not yet been determined. In addition, according to the "Avatar 2" crew, the final cut of "Avatar 2" has not yet been completed. Therefore, the specific time has not yet been determined. So, when the final cut comes out, maybe the real length of the movie will not reach 3 hours at all.
It's worth mentioning that many people remember James Cameron because of "Titanic," a movie about a grand love story. This movie is over three hours on set. The success of "Titanic" showed that if audiences were captured by the storyline, they weren't swayed by the length of the movie. Also, since the first Avatar still holds the rank of the highest-grossing film of all time. Therefore, in fact, there is no need to worry too much about the box office and performance of "Avatar 2". Because, after all, this movie was directed by James Cameron himself.
As for why the second movie took so long to wait. Because, in addition to telling a story of more than ten years, this film also laid the groundwork for the next few films. "Avatar 2" established the universe of Pandora even more. In other words, in addition to the technological development of movies over the years, James Cameron is also constantly building the world of "Avatar". Anyway, according to James Cameron, he doesn't think the length of the movie is an issue at all.
In general, no matter whether "Avatar 2" is finally released, it will be 3 hours or not. Now many blockbusters of Hollywood almost have to reach 3 hours. What's more, "Avatar 2" is a movie we have been waiting for for more than ten years. If Kashen's more than ten years of hard work were integrated into these 3 hours, it would not be impossible.