Like moosehunter said 6-8 months, but like Tree climber, I have a vacum Packer and just found a pack from the 03 season. (season before last) and it's like pudding. My T Fine.
I'd invest in one if I were you. I'd always rather go into the hunting season with some goodvenison in the freezer, rather than none. Takes the pressure off if you know what I mean.