By default, there is no restriction.
To limit the number of concurrent online users of a local account, run the following command in the AAA view:
local-user xxx access-limit # Specifies the number of connections that can be created with a specified user name.
The actual number of connections is the smaller value between max-number and the maximum number of users of a type on different models.
And if you use the built-in Portal server, the maximum number of users supported is 1024