"I can't say." Bullshit, actually. He is perfectly capable of giving an answer precise to the second. But why should he?

The assessment that Near isn't much of a fighter is an accurate one. He is, in fact, almost as pathetic as he looks. He is aware of this, and plans accordingly. It would in all likelihood take godly intervention for Near to start an altercation no matter what Yukari says; he just isn't easily goaded.

"But long enough to notice the issue you're having." Depth perception problems, in his estimation.