Depending on the climate you are in, your fondant may be affected. That is, if you live in a very dry climate as is my case. In Madrid during the summer, the temperature is so high that by itself it hardens immediately, a portion or in its entirety. It does not mean that it has expired, but it is true that it makes its duration much shorter.
I hope all these tips have been useful to you, and if you have any questions you can let me know in the comments.