They don't go bad. So you can make them weeks in advance or days in advance just depends on your schedule
I just ordered some (pre-made) However, the mold is the best was to go as far as money cause you can make them over and over again.
The isomalt is some times referred to as "sugar candy" so technically yes it edible, However, it's too hard and no one tries to eat it. Just be careful of the age you make them for because the hearts are a choking hazard
Good Luck
Even a fool, when he holdeth his peace, is counted wise: and he that shutteth his lips is esteemed a man of understanding. Proverbs 17:28
Even a fool, when he holdeth his peace, is counted wise: and he that shutteth his lips is esteemed a man of understanding. Proverbs 17:28