The XML for Analysis request timed out before it was completed.

I'm sorry to tell you that the way i solved it, is not a solution you are looking foward. I pay for more bandwith and reduce de size of power bi desktop file adding logic to a view in sql (instead of taking tables) and to dax, removing all posible from edit query. 

The files start to size 500mb, and with more bandwith work in 5000 seconds.

Regards,

7200 is a power bi limitation.