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.

The complete Astroboy box set I think

Or maybe it was Urusei Yatsura

I believe the Tetsuwan set was just slightly longer than Urusei.

But when reading the subject I though what was the longest collection, though it was 48ft 2 inches

Well,

Urusei Yatsura: Perfect TV Collection [KACL-001~050] has more sides (99) but runs 5,100 minutes/85 hours.
But Tetsuwan Atom Astroboy: Limited Deluxe Edition (1963) [SF220-1700] has less sides (93) but runs 5,580 minutes/93 hours.

These are all the sets above 900 minutes/15 hours:

https://www.lddb.com/search.php?adv_search=*&format=ld&length=900&length_op=more&format=ld&max=250

Julien