Is there any limitations with "Call to Test" functionality?

We are planning to use call-to-test functionality in larger scope. We are using Zephyr Scale Server. I would like to know if there are any limitations:

• How many different call-to-test links can a single test case have ?
• How many different test cases can have a single test case inside ?
• Is any known limitation/boundaries, system vulnerabilities what could affect our experience in negative way ?