Does anybody know roughly how long mxe can keep for? I bought some about a year ago, but then went to work abroad and only just discovered it again. I was storing it in a cool, dark place. Obviously the best way to find this out is just to try it and see if it's still ok, but it would be nice to know if it's very likely to be no good now, as it's never any fun sitting there waiting for something to kick in, and then it never does!