What's she getting out of this?
Counting her time? Walk away, be inaccessible, change the subject and talk incessantly so she can't get a word in.
Being right? You got that one covered.
Controlling him (using the captive audience to say whatever she wants)? Walk away, say you don't believe she's right, say no to everything she says, talk nonsense back to her so she tires out.
My strategy is to figure out what the dub is getting out of this behavior, and then remove that reward. B.F. Skinner said that works. So did Sheldon. Chocolate?