The problem of perception and conceptualisation of time in the unconscious and the conscious is seen in terms of Matte-Blanco's theories. In a short outline of his ideas, symmetrical and asymmetrical logic and his newer concept of 'bi-logic structures' are discussed. Clinical examples from the psychoanalysis of a patient with a time problem are presented to illustrate the hypothesis that a misperception and misconception of time lead in this case to obsessive-compulsive pathology. The clinical application of Matte-Blanco's postulations not only explains the psychopathology of the patient but also allows the formulation of a treatment strategy leading to a positive solution of the problem.