Schedule Refresh timeout issue - Import from Azure Blob

Hi,

We import and parse json data from azure blob. 

I happened to know the limitation for data size is 10 GB and refresh timeout is 2 hours.

https://docs.microsoft.com/en-us/power-bi/refresh-troubleshooting-refresh-scenarios#uncompressed-data-limits-for-refresh

We are hitting this timeout issue with data source size of 5.5 GB. 

I infact tried with the storage account ( which has 250 MB data) and it took around 15 min to fetch and display the report.

As per the above link, "Scheduled refresh for imported datasets timeout after two hours. If you are encountering this limit, you can consider reducing the size or complexity of your dataset, or consider breaking the dataset into smaller pieces"

1. I would like to know the optimization techniques that I can follow for my datamodel to process 10 GB BLOB data in 2 hours. Is this possible?

2. Is there any limitation on azure blob data to attain that level of performance? If so, how much blob data size is supported given timeout limit?