I can't see it going off. Just keep it somewhere cool. The main danger to its quality will be it drying, so bag it if it is not already well sealed. Freezing it isn't necessary and would take up useful freezer space.
What the bees did not eat as fondant, I have made into a simulative feed (approx 1:1) by putting the dried fondant in a bucket and adding just enough water to disolve it.