Well I've done some reading on the subject. As long as you keep it out of the sun and below 100 degrees vg last for at least 14 months. Pg based lasts much longer. I use vg. It easier to get my 20/80 mix. I plan on leaving it in the big bottle and making 200 mil at a time. Only because I have 2 glass 100 mil bottles. If anyone know better please jump in. I never had this much at once. 
Tony
Tony
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