He could die in 24 hours.
4 seconds sound clip from the Alien (1979) movie soundboard.
You can hear this line at 00:35:47 in the Blu-ray version of the movie.
Quote context
[...]
- Something has attached itself to him. We have to get him to the infirmary right away.
- What kind of thing? I need a clear definition.
- Listen to me. If we break quarantine, we could all die.
- Look, would you open the goddamn hatch? We have to get him inside.
- No. I can't do that. And if you were in my position, you'd do the same.
- Ripley, this is an order. Open that hatch right now. Do you hear me?
[...]