Hi Ana,
As I’ve checked the related articles below about the feature in Office to be able to edit multiples users in a document simultaneously, there’s no established or specific total number of users who can make
the changes.
Collaborate on Word documents with real-time co-authoring
Collaborate in Word
However, you may take note of too much users that are editing the document, as it may affect its performance and may result conflicts as well. The changes may not sync properly if there are a lot of revisions
being made to the file at the same time.
Based on the user experience, it is recommended to have a maximum number of 10 editors that can work on a specific document concurrently.
Let me know if you have any clarifications on this.
