Final answer:
The default cache time for DAX is 5 minutes, aiding performance by reducing the frequency of querying the data source.
Step-by-step explanation:
The default time that DAX (Data Analysis Expressions) caches the results is 5 minutes. This time frame allows for improved performance in Power BI and other applications that use DAX, as it reduces the number of queries that need to be executed against the underlying data source when the data hasn't changed. It's important to understand that this caching behavior can influence how often your data visualizations and reports get updated with new data.