- How long did you knew him?
- Almost four years.

6 seconds sound clip from the The Doctor Prescribed Death (Suspense) classic radio play.

You can hear this line at 00:08:26 in the radio play.

Quote context

[...]

- And you would kill yourself to let your poor mother suffer because of the wrong of another?

- Why shouldn't he be the one to suffer?

- I suppose you're right. Why shouldn't he?

- What happened after all? Why not tell me about it?

- Were you married?

- No. He never seemed to find time to get around with marriage.

- What's your name?

- Gladys... Gladys Tanner.

- How long did you knew him?

- Almost four years.

- And you always thought he meant to marry you?

- Yes, until three weeks ago.

- On July 1st he had to leave town for a week on business. Said he was going to Kansas City.

- When he came back he seemed to be too busy to see me.

- Then, a week ago I found a snapshot along with several others in his desk, in his home.

- May I see it?

- Sure.

[...]