The length of DB mangas differs. It depends on factors like the story's complexity and the author's vision. Some might run for just a few volumes, while others could have dozens.
The official Fortnite is mainly focused on battle royale, building, and fun adventures. It has a broad audience including kids and teenagers, so it would never have something like an 'erotic story'.
Fortress Night was a sandbox third-person shooter game developed and published by Epic Games. The game featured a free construction system and multiplayer confrontation, earning high reviews and high points. However, there were several reasons why Fortress Night was not popular in China. First of all, the game's American manga style was not accepted by the majority of players in China. Secondly, the game was difficult to operate and was not very friendly to novice players. Players needed to learn and practice on their own. In addition, the game's matchmaking mechanism was not like other popular games that had a ranking mechanism. New players could easily match up with old players or professional players. These factors might cause Fortress Night to be less popular than other games in China.
I'm not sure specifically what 'db new story' is about without more context. It could be a new story related to a database (db), perhaps a new narrative within a database - related project, like a new data - entry story or a new development in a database system's history.
In my view, 'fiction db' is probably a term used in a particular field or industry related to fiction. It could be a database used by authors, publishers, or researchers to organize and access data about fictional works. But again, we'd need more details to know for sure.