John Candy only had one day to film his Home Alone scenes, and he did it all in 23 hours. Gus Polinski was "a simple character," the director said of Candy's portrayal, "yet he came to the set with an intense backstory in his head. I never heard about it. I got to learn about it in those 23 hours of shooting."
https://people.com/john-candy-filmed-home-alone-scenes-in-23-hours-1180…