Power BI Service Refresh (BigQuery) Last Hours vs. Desktop

Hello everyone,

We have a dashboard based on our BigQuery DWH.

When refreshing the data on Power BI Desktop , the refresh lasts about 30 min

When attempting to refresh it on Power BI Service (refresh now / scheduled) , it lasts more than 2 hours (X4) or fails due to timeout.

Does anyone know what may lead to this issue? or how can I speed things up?

Thanks in advance!