On an Antarctic research station, money is rendered useless, and essential material goods are imported from participating countries. Recognizing time as a valuable resource and acknowledging the existence of gift-giving practices, this article investigates the economic exchanges among members of an Antarctic expedition. Drawing on a 15 month ethnographic study conducted at the French Dumont d'Urville Station from November 2019 to January 2021, I analyse the gift of time and the exchange of services among the 24 members of the 70th expedition to Adélie Land, isolated for 8 months by the winter pack ice. The study presents an anthropological perspective on overwinterers, a population predominantly studied within the field of psychology, and examines the extent to which mutual aid and volunteering, which are often overlooked, shape interpersonal relationships and group dynamics. By exploring the ethnography of Antarctic time in relation to work and delineating various categories of service exchanges, we gain insights into individual motivations, causes, consequences and sanctions within the broader context of social relationships. I propose the hypothesis that the perpetual cycle of indebtedness among overwinterers plays a significant role in maintaining the smooth operation of an Antarctic station and fostering social balance within a winter crew.