Power BI Refresh Frequency

This specific sub forum is for on premises Power BI Report Server topics. Note that on-premises the number report dataset refreshes in not controlled by licensing. From your question, you seem to imply this is hosted in the power bi service. 

A pro license there gives you rights to share content with other pro licensed users. Premium licensing is meant for broad distribution to other non-licensed report consumers. By refreshing, you can refres the report itself as often as desired, but the underlying dataset can be refreshed per the license limitations. For Pro that is 8 times per day. For Premium (and Premium Per User) that is 48 per day. 

If you need more up to date data, consider using direct query, where report views will re-query on-demand (provided you accept some additional perf latency due to connection time and underlying database). 

https://docs.microsoft.com/en-us/power-bi/connect-data/desktop-use-directquery