That's about the size of it, sir.

3 seconds sound clip from the Dr. Strangelove movie soundboard.

You can hear this line at 00:28:04 in the Blu-ray version of the movie.

Quote context

[...]

- Well, I'm afraid we're unable to communicate with any of the aircraft.

- Why?

- As you may recall, sir, one of the provisions of Plan R provides that once the go code is received, the normal SSB radios in the aircraft are switched into a special coded device which, I believe, is designated as CRM 114.

- Now, in order to prevent the enemy from issuing fake or confusing orders, CRM 114 is designed not to receive at all unless the message is preceded by the correct three-letter code group prefix.

- Then do you mean to tell me, General, that you will be unable to recall the aircraft?

- That's about the size of it, sir.

- However, we are plowing through every possible three-letter combination of the code.

- But since there are 17000 permutations, it's going to take us about two and a half days to transmit them all.

- How soon did you say the planes would penetrate Russian radar cover?

- About 18 minutes from now, sir.

[...]