I'm wondering what laserdisc set has the longest runtime. Based on a Wikipedia article of the longest movies by runtime, the 25th longest movie of all time,
Little Dorrit: Charles Dickens (1988) [37222 A/B/C/D] has gotta be the longest movie released on laserdisc, as it's 359 minutes.
Are there any sets that are longer? There are only 6 longer films released before 2000, so I'm pretty confident that's the longest film on LD.