I'm making the cake for a baby shower in a couple weeks. Some parts will need to be made out of RKT. I obviously want to do these ahead of time but how far in advance is too far? I mean, I doubt anybody will end up eating it when there's cake but i'd rather them not bite into a stale treat if they try. Has anybody ever tasted a RKT a week old? Two weeks old? I definitely won't be starting yet. Any storage advice on this stuff (pre and post fondant, etc)? Thanks!

RKTs last a long time, and it takes forever for them to go stale. Think nothing of making them a week or two in advance. Just seal them with something (royal icing or ganache are my go-tos) that will smooth out the surface and fondant away. You should cover the figures pretty soon after you make them, as this will help ensure the freshness of the RKTs, and then keep them away from the dust and light (especially if they've been colored) but not in an airtight container - maybe in a cardboard box.