The recent resurgence of interest in, and exhibitions of, contemporary and historical works of performance art, coincides with emergent dynamics in the visual arts where persistent attention is being drawn to the temporal nature of art's production, existence and reception. This essay looks at the question of the temporality of art practices, in particular examining how one might think of their duration. Through analysis of historical works and numerous current examples of 'Durational Aesthetics' the essay investigates what it means for an artwork to present life, or to be a life, and what such formations might say about the conditions of lived experience in contemporary culture and society.