I've always been a trimmer and currently have a stylist who understands to just take take a tiny bit off. I didn't even look to see how much she trimmed. I only trim when the ends feel dry and tangle easily. I like the look of my hair with a nice edge.

I just had a trim last week and it was the first since last July. I measured for the first time on dry hair so I'm not absolutely certain of the accuracy, but today (3/6/16) I have 22"