The original "Halloween" movie, released in 1978, was filmed on a tight budget and schedule. According to various sources, including interviews with the filmmakers, the production of "Halloween" took approximately 20 days to complete. This relatively short shooting period is a testament to the efficiency and resourcefulness of the film's director, John Carpenter, and his team. Despite the limited time and resources, "Halloween" went on to become a highly successful and influential horror film.