Yep. I have one. It's a bourbon mash up.
I usually pour the last bit of my preferred bourbon's into it. "IF" they're a favorite, and never any of the "it's ok" stuff. I keep a list of what's been added so I can see where I'm at.
I pour a few fingers time to time once it gets up halfway or so to see where it's at. Essentially it's your custom blend at that point.
I hit a point last summer that was amazing and a friend of mine sat there and drank most of it. LOL. Had to start over.
Tough job, but it has to be done!