Do you put it in a cool, dark place like a basement, or do you put it in the refrigerator?
I brine mine is a coleman chest cooler. I think it is a 50 qusrt size. Is just right for submerbing the turkey and the liquid brine to both fit.
It should be kept cold, so if you can fit in in your fridge do that. I generally don’t have room, so I use my garage which is always plenty cold come late November.