I have 1.5 liters in my freezer now. I started at 24mg but now I'm down to 6mg. At 6, that should last a long time. But that would be fifty 30ml bottles, and that's a heck of a lot of bottles! If you store in boxes you are either not freezing it or you have quite a large deep freezer without all the frozen food most people stuff in them. And it may be more important to store in the freezer than a couple extra openings. Anyway, the way I threaded that needle is I broke the liters into something like a 500ml bottle, a 250 ml bottle, a 120ml bottle, and a couple 30ml and 60 ml bottles. I keep one 30ml bottle at room temp in a cabinet. My thinking is that, worst case, the NIC will get transferred a couple of times, something like 500ml-->250ml-->120ML-30/60ML over the course of a year or two or more. My sense is that those few pours are not going to degrade things. Now, if I kept a liter or 500ml bottle in a cabinet and drew from it a hundred times, that would be different, and that is what I'm trying to avoid.
Just my own take on that, with no hard evidence.
Of course, my husband will have to sacrifice some ice cream storage. 
I kept seeing "the list" with all the suggested usage percentages and the list kept growing. Got to page 50ish and thought, "Dumb A! Go to the last page and work backwards to find the most up-to-date changes. Duh!!" (I'm slow but I'm steady. 
