A visit duration control system comprises a sensor (10) for sensing one or more physiological parameters of a person over time allowing the quantification of stress load of said person, a visit detector (20) for indicating the start of a third party's visit to said person, a processor (30) for determining said person's stress load from said one or more physiological parameters during said third party's visit and a signaling unit (40) for issuing a warning signal if said stress load exceeds a predetermined level.