Rule of thumb is to hold at 0F for three days, which is long enough to kill eggs. Note that that's hold for three days, so three days plus time to get to zero. in gallon bags, it shouldn't take too long to get there (depending on your freezer.) It won't hurt to do it longer, nor to do three or four at a time, if you haven't got freezer space to fit them all. (just don't mix frozen and unfrozen...) If you're using the freezer compartment of a fridge, it probably won't get to zero, and you should hold longer, but I don't have a guideline (I'd do a week, but I don't have a reason for that.), nor do I know the lowest temp weevil eggs can survive at.