It is known that the order of publication of the psychoanalytic courses of Jacques-Alain Miller is not chronological. This course, Los usos del lapso / 1999-2000), addressing the immemorial theme of time, produces a new refutation of chronological time as a principle that aspires to become a fundamental concept of psychoanalysis and its exercise. It does so by updating a logic congruent with the uses of the lapse and of what operates in the interval, in the effort of matching the time of the unconscious to a real and its exabruptos. Hence, the core that is ordering this course is the practice of the short session. This doctrinaire point, Jacques-Alain Miller followed Jacques Lacan step by step; it is known that this is a point on which Jacques Lacan did not give way and which today maintains its vegetation. It also verifies in what way and why psychoanalysis of Lacanian orientation is a theory of practice and is separated from any conception that seeks to reduce it to techne, which is but one of the forms of routine. William Osler, a contemporary Canadian physician of Freud, said that seeing the sick without books is like navigating without sea charts; But reading books without seeing sick people means not embarking. Jacques Lacan did not deprive himself of calling adventure the experience of analysis; Jacques-Alain Miller is not deprived of introducing in the course the amusement. Joyful learning is part of the adventure. The attentive reader will find in the course the occasion to enjoy it, if it is open to the surprise to which it is summoned. And he will be able to access the necessary resources to support with more solvency the vicissitudes and misadventures to which he is requested as a post-analyst in this century, so lavish in them. Knowing that these resources do not have to avoid some worries, inherent to the contingency. The psychoanalyst warned will have some chance of facing it if he manages to find in it the opportunity of his action