It's supposed to last for 2 years after the production date on there! But if you open it, it's best to keep it refridgerated and not worry about how long it'll last. I'd say almost a year outside the fridge (after openned) and up till the 2 year period if kept in the fridge!
Keep it for a few years and smoke it, let us know what it tastes like
Just Kidding, I'm noone to listen to when in a funny mood!