A previous answer to an Experts Exchange question reveals specific configuration settings for session limits, but it fails to tell where these setting should be made:
Question: What is the difference between the settings in Citrix Policies (ICA\Session Limits) and similarly named settings in the "ICA Listener Configuration Tool", can the ICA Listener Configuration Tool be set by GPO?, how do Session Linger and PreLaunch Settings figure into the equation.
Citrix Support articles
... detail two locations for making configuration settings; however, there is not much discussion about the relationship and interdependencies of the two configuration methods ("policy settings" versus the "ICA Listener Configuration Tool").
There are also similarly titled settings in both locations, but documentation does not clearly differentiate between them - such as "Session Timers/Limits" and "Disconnected Session Timer/Limits.