Every product has a different shelf life based on the ingredients. See below for an estimate.

Black & Gold Coutures - 1 month
Pearls - 3 months
Truffles - 3 months
Os - 3 months
Fruit and Nuts - 3 months
Bars - 6 months
Salted Caramels - 6 months
Hot Chocolate - 6 months
Honeycomb, Mallows and Trinidad Tins - 6 months