Yai says we're two to three days' march from the Kwai.
3 seconds sound clip from the The Bridge on the River Kwai movie soundboard.
You can hear this line at 01:46:36.733 in the Blu-ray version of the movie.
Quote context
[...]
- Three, you should synchronise demolition with passage of train.
- Four, good hunting. Have fun. That's all, sir.
- A train and a bridge, that would be something.
- That would really be a show. Can we get there in time, sir?
- Yai says we're two to three days' march from the Kwai.
- If we set a faster pace, we could make it before sundown on the 12th.
- It's worth having a go for the train, don't you think?
- Good hunting. Good show. Jolly good fun. Jolly, jolly good.
- If you hadn't fixed the radio, we wouldn't know about the train.
[...]