Adam told me awhile back that his NETs can last up to a year provided they are stored in the refrigerator. I mentioned on a followup post that I had some 10-1/2 month old PB that went bad on me. I never stored it in the fridge. I've had others run up on a year and they didn't seem too bad. But I suspect a year is close to right...give or take a little depending on the juice and how old the extract was to begin with. Also, NETs could be different than non-NETs or more generally anything that has a natural extraction. I'm just guessing, but I suspect many flavorings have preservatives in them. NET extractions would likely not.