There's no clear indication that 'Hitman Contracts Ghost Story' is a new addition to the Hitman series. The main Hitman games usually focus on Agent 47's assassinations in various real - world - like locations with complex gameplay mechanics. While there could be some Easter eggs or side stories in the games that touch on spooky or ghost - like elements, this 'Ghost Story' doesn't seem to be a widely recognized new addition. It could be a very niche or experimental part of the Hitman franchise, or perhaps something that was planned but never fully developed into a mainstream addition.
Since there's not a lot of information publicly available about a 'Hitman 2024' real story at the moment, we can only make assumptions based on the previous Hitman games. In the Hitman series, the story usually revolves around the highly skilled assassin Agent 47. He might be facing new and challenging contracts in 'Hitman 2024'. There could be new locations, new characters that are either his targets or allies in some way, and new ways of carrying out his assassinations. For example, there might be more advanced technology to use or avoid while on a mission.
The story of Hitman 3 typically lasts around 20 hours. However, this can change based on how thorough you are in completing missions and uncovering all the hidden elements. Some players might finish quicker, while others might spend more time getting the most out of the experience.