I started buzzing short a few weeks ago because I am finally dealing with my MPB. I have an adjustable beard trimmer where I just twist a dial to change the length.
I have been doing 9 mm on the back and sides and 10 mm on top.
Right after reading this post I went to trim it a bit before showering. I started at 5 mm on my sideburns then forgot to adjust it for the back and sides. So now, I'm at 5 mm everywhere. While laughing, my wife said I should have just shaved it.
That's okay though. My plan is to look like Jason Statham, so it was going to come off soon anyway.