The phrase “how long is Sonic 3” can mean two different things right now:

  • The movie “Sonic the Hedgehog 3”
  • The game “Sonic the Hedgehog 3”

Here’s the quick scoop on both, since they’re both being talked about online.

Sonic the Hedgehog 3 (movie)

Most current cinema listings and fan discussions put the Sonic the Hedgehog 3 movie runtime at about 1 hour 49 minutes (≈109 minutes) , which is:

  • A bit longer than the first Sonic movie
  • Slightly shorter than Sonic the Hedgehog 2 in theaters

So if you’re planning a trip, you’re looking at roughly two hours in the theater including trailers.

Sonic the Hedgehog 3 (classic game)

If you meant the 1994 Sega Genesis game :

  • Typical “main story” clear for an average player: around 2–3 hours once you know the stages reasonably well.
  • Some guides and articles frame the experience as about 6–8 hours when you factor in exploration, retries, and learning the levels, especially for newer players who aren’t used to classic Sonic physics.
  • Completionist or achievement-focused runs can stretch past those estimates depending on skill and how many collectibles/special stages you go for.

Forum-style take

If you browse Sonic forums and fan chats, the pattern is roughly:

  • Movie fans : Talk about it as a “standard-length family action movie” at just under two hours.
  • Retro game fans : Call Sonic 3 a “short but replayable” platformer, where the real time sink comes from replaying zones, chasing Chaos Emeralds, or going for full achievement lists rather than just beating the game once.

In other words:

  • Movie Sonic 3 ≈ one evening.
  • Game Sonic 3 ≈ an afternoon, longer if you chase everything.

TL;DR:

  • Sonic the Hedgehog 3 movie: about 1h 49m.
  • Sonic the Hedgehog 3 game: roughly 2–3 hours to beat , up to 6–8 hours if you’re newer or more exploratory.

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