Sailor says you gotta go a long time, maybe 500 hours, before you can get so you can sleep while you're still moving.
8 seconds sound clip from the They Shoot Horses, Don't They? movie soundboard.
You can hear this line at 00:28:54 in the Blu-ray version of the movie.
Quote context
[...]
- Don't let them give you any codeine. It'll pass you out.
- Around and around and around. Ninety-seven hours of continuous motion.
- Let's give these wonderful courageous kids a great big hand, huh, folks? That's the spirit.
- Why don't you try sleeping on my shoulder? I won't let you slip. You can trust me.
- That's what the last guy said.
- What?
- Gloria?
- She's there again. She must live here.
- You really ought to be nice to her. Rollo told me she's trying to get us a sponsor.
- Look, it could mean four bucks a week, clean socks, and new shoes. Come on.
[...]