Final answer:
In Salesforce, the maximum number of object references for a custom report type is 50, which allows for extensive reporting across multiple related objects.
Step-by-step explanation:
The maximum number of object references for a custom report type in Salesforce is 50. When creating a custom report type, an object reference is created for each related object that is included in the report type, starting with the primary object and extending to related objects through lookup or master-detail relationships. This means that a user can have a primary object, and then add up to 49 related objects in the report type, allowing for comprehensive reports that can span across multiple related objects within the Salesforce platform.