"Proust was quite close with his mother, despite her wishes that he apply himself to some sort of useful work. In order to appease his father, who insisted that he pursue a career, Proust obtained a volunteer position at the Bibliothèque Mazarine in the summer of 1896. After exerting considerable effort, he immediately obtained a sick leave which was to extend for several years until he was considered to have resigned. He never worked at his job, and he didn't move from his parents' apartment until after both were dead (Tadié)."
In other words, the very first thing he did at his new job was take a several year sick leave!