Hi Alejandro,
Thank you for posting your concern.
Could you please confirm if you're still encountering the issue? The report download requests may time out on extremely large data sets. There is no explicit data size limit; however, due to a variety of factors, the server may return an error if the report is too large. If so, could you try the report with a shorter date range or use predicates to break up the report request into multiple, smaller requests. If you're still having an issue, so I can further investigate, could you provide the complete report definition together with the Client customer ID via Reply privately to author?
Regards,
Hiroyuki
Google Ads API Team