Experiences of life-altering illnesses similarly alter one’s experience of time. In this chapter, we examine how the specificities of cancer treatment and care impact understandings of time. Cancer involves the invocation of survival statistics in both its discursive construction and lived experience, leading to a constant negotiation of temporal horizons which are made uncertain by illness. We turn to Karen Barad’s work on troubling time to consider how time is rearranged and reconfigured in the experience of cancer diagnosis, treatment, and care, especially for those who outlive their prognosis and exist in the uncertain terrain of living on ‘borrowed time’. Drawing on in-depth qualitative interviews conducted with 80 people living with cancer and 50 carers (including 49 patient/carer dyads), we examine the temporal and relational entanglements of a cancer diagnosis. What happens when the continuity of one’s self, underpinned by an orientation toward the future, is cut short by the certainty of impeding mortality, or even mortality that is now ‘overdue’? What temporal landscapes are made possible, which recede, and what futures are imposed upon one’s present? What are the specific contours of living ‘on borrowed time’ and how does terminality imbue the time remaining of one’s journey through life?