Is There a Limit to the Amount of Documents That Can be Added to a Document Change Control Process (DOCC)?

There is technically no limit to the number of documents that can be added to a Document Change Control process. 

It is important to note that the number of documents will have an impact on the loading times when accessing the process instance or any of those documents. This is due to the information that has to be retrieved and the verifications (privileges, available actions based on statuses, relationships, etc.) that have to be done when a user accesses these items.