- How long since you've been home?
- Oh, a couple of centuries.

4 seconds sound clip from the The Best Years of Our Lives (1946) movie soundboard.

You can hear this line at 00:05:36.470 in the Blu-ray version of the movie.

Quote context

[...]

- Hi, sarge.

- How are you?

- My name's Fred Derry.

- Al Stephenson.

- And this is Homer... What is it, Homer?

- Parrish.

- Glad to know you.

- Glad to know you, sarge.

- You from Boone too?

- Yeah, sure I am.

- How long since you've been home?

- Oh, a couple of centuries.

- We'll sit in the radio compartment until the takeoff then we'll get in the nose and get a nice view of the good old U.S.A.

- Okay.

- Boy, oh, boy. Hey, look at that. Look at those automobiles down there. You can see them so plain, you can even see the people in them.

- Yeah, looks like we're flying by road map.

- Is this your first ride in one of these things?

- Heh, yeah, this is my first plane ride.

- I saw plenty of flying, all right. I was on a CV. That's a flattop. But I never knew things looked so pretty from up here.

[...]