À la recherche du temps perdu, by Marcel Proust, has an untold critical fortune, with readings and studies ranging from Walter Benjamin to the young Samuel Beckett, including Jean-Yves Tadie, Georges Poulet, Gilles Deleuze and Paul Ricoeur. The present text is a marginal note to the concept of threshold in Proustian writing, permeated by some of the constitutive topoi of the work of Proust, such as the concepts of trace, memory and time. With the questions it raises, the paper establishes a specific dialogue with the readings of Walter Benjamin, Samuel Beckett and Giorgio Agamben, in order to analyze the concept of threshold in its temporal implications, such a characterization being understood to be crucial to some important developments o...