Q:  How long will the cotton candy last (assuming we don't eat it right away)?

A:  Once opened you typically have a few days to enjoy it before it begins to shrink and harden assuming the lid is replaced after each snack.

Q:  How do I prevent my cotton candy from shrinking?

A:  Keeping the cotton candy in a cool dry location is best, such as a cupboard.  Sunshine, excessive heat, high humidity, and excessive vibration will all reduce the life of the product.