Demon Slayer: Infinity Castle Part 1 clocks in at 155 minutes (2 hours and 35 minutes), making it notably longer than the 2020 Mugen Train film's 117 minutes.

This epic runtime packs intense battles and stunning Ufotable animation, leaving fans stunned as headlines proclaim.

Release Timeline

Part 1 hit Japanese theaters July 18, 2025, and expanded to North America on September 12, 2025—still drawing record box office crowds into early 2026.

  • Part 2 : Slated for 2027, building hype with staggered global rollouts.
  • Part 3 : The finale eyes 2029, capping the Infinity Castle trilogy.

Crunchyroll's streaming delay keeps it theater-exclusive for now, sparking fan debates online.

Fan Reactions

"Demon Slayer Fans Are Stunned by How Long the New Movie Is" – Fans buzzed over the trailer's promise of high-octane action in that extended cut.

Reddit threads predicted fall 2025 drops, with some guessing 90-120 minutes per film—155 minutes blew minds.

One forum user quipped: "A 90 min movie is 3-4 [episodes], this is 6-7!"

Why the Length?

This surpasses Mugen Train 's runtime to adapt the sprawling Infinity Castle arc, blending recap with fresh clashes against Muzan.

It's the "sweet spot" for theaters: long enough for immersion, short enough for multiple daily screenings that fueled Mugen Train 's $507M haul.

Conflicting reports mention ~110 minutes, but official cites pin 155—perfect for popcorn-fueled marathons.

TL;DR : 155 minutes for the newest Demon Slayer flick—buckle up for battles that demand the big screen.** Information gathered from public forums or data available on the internet and portrayed here.