Updating time report

Hello Community, 

I have created a report with some normal tables and there is not any calculated row/columns, just normal data in differents formats (text and numbers).

To have this report updated, I am using the automation of PowerBI for launching the update in specific scheduled time but even it is working, it needs around 20 minutes to update the report even if there is not any changes on the data.

Do you know what could be the reason of this issue? am I missing something?

Thanks!