You usually see the Alien fairly early in Alien: Isolation — often within the first hour, and sometimes sooner depending on how quickly you move through the opening sections. The game builds tension before that, so the first real encounter is delayed on purpose.

What to expect

  • The Alien is not present as a constant threat from the very start.
  • The opening stretches focus on atmosphere, exploration, and smaller dangers.
  • Once it appears, the game shifts into its main hide-and-seek loop very quickly.

Practical timing

  • Fast players: around 30–45 minutes.
  • Average players: around 45–75 minutes.
  • Slower, cautious players: closer to 1–2 hours.

Those ranges vary a lot because the game is paced around suspense rather than a fixed countdown.

Why it feels longer

The game uses sound, empty corridors, and smaller encounters to make you expect the Alien before you actually meet it. That delay is part of what makes the first sighting memorable. TL;DR: Expect the Alien in the first hour for most runs, with cautious play pushing that closer to 1–2 hours.