Those are really cute! I always make my figures 1 or even 2 weeks in advance. They do get hard, but I think if you don't use any gumpaste they will still be fine. Good luck!
if you keep them in an airtight container they will remain soft.
LOL! Funny you would ask! I got a baby mold about 8 months ago & my mom was so tickled with it that she made me make her a fondant baby. I was just at her house tonight & she STILL has the baby! Still in the ziplock bag I sent it in. I wouldn't eat it, but it wasn't molded or anything! Makes you wonder how many preservatives are in those marshmallows of that fondant!