As of my knowledge cutoff date in September 2021, "Alan Wake 2" has been announced by Remedy Entertainment, the developer of the game. However, specific details regarding the length or duration of the game have not been officially disclosed. Typically, the length of a video game can vary depending on various factors such as the player's gameplay style, completionist tendencies, and the overall design of the game. "Alan Wake 2" is expected to offer a rich and immersive storytelling experience, potentially with a similar length to its predecessor, which was around 10-15 hours long for the main story. For the most accurate and up-to-date information on the game's length, it is recommended to refer to official announcements from Remedy Entertainment or the game's official website.