How long can non-aerated buttercream be stored in a barrel with a lid?

Non-aerated buttercream can be stored in a barrel with a lid for up to 5 days if kept in a cool, dry place. This storage duration is important because it helps maintain the texture and quality of the buttercream, as well as prevent spoilage. The sugar content in the buttercream acts as a preservative, but it still has a limited shelf life due to the dairy content, specifically the butter.

Storing it for longer periods may result in changes to its flavor and texture, or even a risk of bacterial growth. Keeping it tightly sealed protects it from contamination and maintain its consistency, but it's best to use it within that designated timeframe to ensure the best quality for baking and decorating purposes.