The first Demon Slayer: Infinity Castle movie (Infinity Castle Part 1) has a runtime of about 155 minutes , which is roughly 2 hours and 35 minutes.

Quick Scoop

  • Officially reported runtime: 155 minutes.
  • That’s about 2 hours 35 minutes of Infinity Castle content in a single movie.
  • This makes it one of the longest anime films ever released, even longer than Demon Slayer: Mugen Train (around 1 hour 57 minutes).

So if you’re planning a theater trip, you’re in for a full-length epic rather than a short special.

Information gathered from public forums or data available on the internet and portrayed here.