There is no "hard" limit. Instead, you will be limited by the number of users your hardware can support and the number of licenses you own to allow users to access the machine.
Thanks. Based on above comment, how many number of licensed user the server can handle?
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As many as you have. The number of licensed users is not limited by the server in any way. You would just have to scale out the server machine appropriately to handle the load. Simply put, you can have as many users as you want if your machine can handle it.
See scalability papers