I will be buying a gallon of 36mg and a liter of 100mg next month to put away, if I figured it right it should last close to 6 years. I use 8ml of 36mg per 120ml bottle of juice.That's the smartest thing to do....proposed is a 2 year period for everyone to meet regulations. I think a lot of people are stocking up already. Good thing nicotine freezes!