What is the maximum number of concurrent sessions when using AWS Session Manager?

Hi,

Does anybody know what the maximum number of concurrent sessions in AWS Session Manager is? I tried to look in AWS Session Manager's documentation but could only find the "maximum duration of session".

Suppose I have a Windows node computer and am connected to it through AWS Session Manager. Can another person (from another computer, using different IAM user) establish AWS Session Manager to that same node EC2 instance as mine?

Regards,