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A user designing a form, viewing their task list, or using a form to enter values and submit has a certain number of minutes to complete the activity. This time limit is call the Session Timeout. By default the session will expire after 480 minutes of inactivity. When the session expires a designer user will have to re-login to to continue designing forms and users filling forms will have to get new form instance and re-enter the values. The tenant admin can override the default session timeout here. See Session Timeout topic in the Installation & Configuration Guide for full details.
Max Concurrent Users
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