Hi James, In the ParallelReportDownload <https://github.com/googleads/googleads-php-lib/blob/master/examples/AdWords/v201809/Reporting/ParallelReportDownload.php> example, it is creating a session for the MCCid to be able to read all the accounts under it. Then, for each account, it is establishing a session in order to run a report against it. For each new client customer id, it has to create a session with the OAuth credentials as the reports work at a client customer id level. Please see this section <https://developers.google.com/adwords/api/docs/guides/reporting#reports_for_multiple_accounts> of guide for better clarity. In your scenario, it is taking a long time as it is not supporting multithreading. The current report has to finish downloading before the next report is started. Please let me know if you have any further questions.
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