Can attest that it lasts at least 18 months at -20 something. Buy a litre at a time and keep it between the chops. Not a hint of ageing noted.We face similar dramas here with this AU nicotine ban still hanging in the air for now. My nicotine is all in the freezer itself set on extra cold as I've been advised it's the best way to store it. My understanding is it can be stored for two years in freezer storage but it could be wrong?
Regards