Maximum number of code can create for one segment

Summary

What is the maximum number of code can create for one segment?

Content (required):

Had 7 segment for the account code to tag different information such as business unit code, chart of account, department and other. Currently, the other segment is not using but company plan to use it for the incoming project. There may have more hundreds project in future.

So, how many code can create for each segment? Is it unlimited or there has limit number?

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):