Welcome to the Cake Decorators Q&A

If I make buttercream with milk and keep in an airtight container in fridge how long will it keep? Will it only last as long as the use by date on the milk?

Hi gucci906

Buttercream is high in sugar so keeps well in the fridge and can also be frozen. Have a look here for lots of information:
http://www.cakeflix.com/questions?s=shelf+life+of+buttercream

Hope it helps.