Welcome to the Cake Decorators Q&A

Heya,

I’d like to make a bag cake and was wondering how long the ganache lasts
if it is used under fondant and kept at room temperature? My concern is as it is dairy will it be ok for 3 days at room temp?

Hello preema

The type of ganache used in the tutorials has a stable shelf lif. You’ll be more than fine for three days +.
Keep the cake in a card board box in a cool room. If you need ganache quantities chart you’ll find it here
http://www.cakeflix.com/blog/how-to-ganache-cakes-without-gnashing-your-teeth
Ganache is probably the second most discussed topic on this site, the first is Paul’s moist chocolate cake recipe.
If you’d like to see the ganache discussions just type in the search box ‘ganache’. You’ll see all different Q & As on the subject, the information may come in useful in the future.