I keep my nicotine in a cool dark place, but I have not refrigerated it, or frozen it, though I do understand that many do. Nicotine does have a shelf life. My understanding from reading about it over the last couple of years, and from several sources is that it retains its potency for about 18 months, and then can begin some chemical alteration, i.e., become less potent. Even though I say I have a two year supply, that means that if I don't make any
juice for anyone else, I'm good for two years. However, these supplies have been lasting me about 6 months lately due to production runs. I have two quarts of 10% Nic in VG, and one quart of Nic in PG, at the moment. If I did believe that I needed it to last more than a year or so, I would probably freeze it. Thus far, it hasnt' been necessary, and I've noticed no issues. My oldest Nic is now 11 months old, and is just as potent as it was when I got it as far as I can tell. I have not chemically tested it, though. All I can say at this point.
TFA is quick to ship, and ships with Priority Mail, so you can generally have packages in two to four days from shipping. If I order on the weekend or Monday, I'll generally have by Friday or sooner, as an example. TFA has consistently shipped my orders the day after the order date. I've had no problems at all with them.