Yes, Vikings Valhalla is based on real historical events and elements. It draws inspiration from the Viking Age, a period in history known for the Vikings' seafaring, raiding, and trading activities. However, it also takes some creative liberties for the sake of entertainment.
Valhalla is the mythical hall of slain heroes in Norse mythology. It's where warriors who died honorably in battle are believed to go to feast and fight for eternity.
Valhalla Murders is fictional. It's crafted by the imagination of the writers and production team. Although it might draw inspiration from real-life events or themes, it's not based on a specific true story.
The length of the Valhalla story can vary greatly. Different authors and sources might present it in different lengths. Sometimes it's a short summary, and other times it could be an elaborate and detailed narrative that takes a significant amount of time to tell.