That’s exactly correct. The thought he’s trying to express is clearly that they responded in four minutes.
No it isn't. Listen to the whole answer.
The question was about why it hasn't been solved. Sheriff is saying one of the main reasons they haven't solved it is because they don't have a lot of evidence since the perp was in and out so quickly.
He goes on to say "If I'm in your house for 25 minutes I'm bound to touch something, leave a fingerprint, DNA, shoeprint, whatever. If I'm only in your house one minute today, ya know, I'm not going to leave much evidence. So, you know, that might be part of it."
His entire answer is about how the perp wasn't in the house for very long. I don't know how it could be more obvious.