The title for the "longest" Halloween haunted house can be measured by either physical walking distance or the duration of the experience, and the Warner Bros. Studio Tour Hollywood often claims a top spot with its "Horror Made Here" mazes, which utilize massive soundstages. However, in terms of a singular, continuous walkthrough, Cutting Edge Haunted House in Fort Worth, Texas, has historically held the Guinness World Record for the "World's Largest Haunted House." Located in an abandoned meatpacking plant, the experience typically takes guests 45 to 60 minutes to complete, covering multiple floors and thousands of square feet. In 2026, many fans also point to Halloween Horror Nights at Universal Studios as the gold standard for "lengthy" experiences, where houses like those based on Stranger Things or original concepts often stretch significantly longer than traditional carnival attractions. These mega-haunts use "conga-line" pulse starting to move thousands of people through intricately detailed sets that can feel endless, often incorporating outdoor transition zones to increase the total physical footprint of the "house" beyond a single building.