- How much time do you think you'll need?
- From where I'm sitting, I'd say a lifetime.
- That's the right answer.

9 seconds sound clip from the Creature from the Black Lagoon (1954) movie soundboard.

You can hear this line at 00:19:04.843 in the Blu-ray version of the movie.

Quote context

[...]

- I didn't mean to startle you.

- I don't know what made me do that.

- That howling out there doesn't help any.

- Those are guariba monkeys.

- You sorry now that we came?

- You don't understand the species very well, Doctor.

- Well, give me time. I thought I was doing well, considering that we've only been together for six months.

- How much time do you think you'll need?

- From where I'm sitting, I'd say a lifetime.

- That's the right answer.

- We may not even have a lifetime.

- In that case...

- You mean this thing really works?

- Oh, yes.

- It's a very positive weapon, the spear gun, and easy to use. All you do is aim it and squeeze.

- What are you going to shoot at?

- Does it make any difference?

[...]