Vacuum Packed: How Long?
I have some high quality vacuum packed [as in all the air removed] box of Arborio rice. It is shamefully old.
How long are vaccum packed grains viable?
I consider them viable for years without vacuum packing.
Foodsaver packed you could probably exhume from an egyptian tomb and eat.
Don't know about grains but I can tell you I'm still using vacuum packed yeast from my freezer that supposedly expired more than a year ago.
I also had a sauerbraten that was vacuum packed and frozen for more than a year. It was excellent.
Not much can happen in the absence of air and moisture. I use the freezer for back up but I think it's the absence of air and water that ensure the freshness. You might just find you have to cook your risotto a little longer. Don't watch the clock; taste your rice for the texture you want.