Sure, let's see what I can get...
Here's the log from where it declared failure...
I had the Kerbin space station contract active as well, and was surprised to find it marked as completed as I flew my partial station to the Mun.
I accepted both contracts before launching anything, and not particularly long ago game-time... maybe a few days? There's no listed time limit on the missions.
Loading a slightly earlier save, though, gets me some interesting results when I look at the contracts with CapCom:
There's a countdown timer for satisfying the Kerbin space station contract, even though I'm not actually meeting its requirements (my vessel is in Munar orbit, and I don't have deployable solar panels).
I'm going to poke around more and see if I can get it between declaring success on the Kerbin station and declaring failure on the Mun station.