How Much Hair Are You Willing to Cut Off?

I went in for a haircut with a new stylist recently, and as soon as I sat down she asked, "What's the most you're willing to cut off during a routine trim?" I was surprised by the question, but she explained that the amount you're willing to trim off if there's damage says a lot about your overall hair philosophy. I'm personally willing to trim off quite a bit when the mood strikes. Plus, I do experimental, sometimes unhealthy, things to my hair. Now I'm curious. What's the maximum you'd ever trim off if you walked in and the stylist said she needed to? And if it's a small number, is it because you want to conserve length, or because you just know how you like your hair?

Source: Flickr User Kevin McGrew