They've been there 30 years.
3 seconds sound clip from the The Skin Game (1931) movie soundboard.
You can hear this line at 00:08:49 in the Blu-ray version of the movie.
Quote context
[...]
- Are you very busy for a moment?
- All right, we'll leave the question of showing for a moment. I'll see you later.
- Don't go, Dawker. This has something to do with you.
- They've been there 30 years.
- I won't have it! It's a breach of faith.
- Do you suppose this Hornblower would care 2 straws about that, Jack?
- He must! When it's put to him if he's any decent feeling. He hadn't.
- The Jackmans talk about his having bought the centry to put up more chimneys.
- What? Impossible. It could ruin the place utterly, besides cutting us off from the dukes.
[...]