Take the Dice Stacker Challenge! I need data!

I'm developing a task resolution mechanic that involves stacking, rather than rolling, dice, and I need data to norm the target numbers/challenge levels. Wanna help?

Go get a bunch of identical (or same size and weight) d6s and make the tallest possible dice stack that your skill allows. Then go to this poll on my Google+ feed and enter the result, and post your personal best in the comments. My personal best is 16. Can you beat that?