Ganache also freezes well. And...I just filled some crunchy flat oat cookies (from Ikea) with
ganache mixed with apricot jam...and the cookies got soft within the day. Still tasted great, but I didn't know I'd lose the crunch factor.
Have you done a test yet?
By the way, to your question: it will last a long time in the frig.
Even longer if you can keep from sneak-eating it with your finger.
Not that I would ever do such a thing.