Welcome to the Cake Decorators Q&A

Once I have put ganache and sugar paste on a cake ,how long will it last

Hi Donna

It depends on the type of cake you are using. Not all cakes have same shelf life. Take a peek here for an answer:

Shelf Life of cake covered in ganache and fondant

……. and lots of frequently asked questions and answers on similar topics here:
http://www.cakeflix.com/questions?s=shelf+life

Worth browsing through for future reference. Hope they all help.