How many Test Cases can exist inside a test plan?

How many Test Cases can exist inside a test plan?

KTern's Digital Labs is developed to execute, manage and collaborate all the testing-related activities of a S/4HANA migration/upgrade project from a single place. KTern completely analyses the entire ECC landscape and auto-recommends the test cases and test scenarios The Test Suite is a container that has a set of tests that help the testers in executing and reporting the test execution status. The Test Catalog contains the test plans, test scenarios, and test cases in a hierarchical manner. 
Each Test Plan can have "n" Test Scenarios and Each Test Scenarios can have "n" Test Cases.
Each Test Case is mapped only to one Test plan.