I put some beans I had in an air sealed container, that was placed in the dark, and then forgot about them for a year and a half, and then germed them, and 7/10 germed. Now, I'm not sure if I'm really lucky, but as long as they're not exposed to sun light and moisture, they should be fine.
Normally a year or two is about it, you get less and less viable seeds as time goes on. However people have found seeds in dad's old vietnam uniforms and germed them and gotten lucky.
Under the right conditions anything is possible, just don't count on it.
I've had bag seed in storage for over 5 years and had no problems germing and growing them. Just make sure they aren't in a humid climate, moisture is they're enemy.
I've had bag seed in storage for over 5 years and had no problems germing and growing them. Just make sure they aren't in a humid climate, moisture is they're enemy.