Synchronized data extensions are data extensions that are automatically populated with data from Sales Cloud objects using Marketing Cloud Connect. They can be configured with filters to limit the records that are imported based on criteria such as field values or record types. By using synchronized data extensions with a filter on the consent checkbox field, NTO can import their Sales Cloud data into Marketing Cloud and leverage it within Journey Builder. Synchronized data extensions can be refreshed as frequently as every 15 minutes, which meets the requirement of having no more than 30 minutes delay. Reference: https://help.salesforce.com/articleView?id=sf.mc_co_data_integration_synchronized_data_sources.htm&type=5 https://help.salesforce.com/articleView?id=sf.mc_co_implement_synchronized_data_sources_best_practices.htm&type=5