I assume you are talking about session timeouts? In case of classic dynpro transactions the instance profile parameter is rdisp/gui_auto_logout and in case of web application (e.g. Web Dynpros) the instance profile parameter is rdisp/plugin_auto_logout. In the latter case you also need to set http/security_session_timeout assuming HTTP Security Sessions are active. See transaction SICF_SESSIONS and talk to your SAP basis admins.
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