A ﬁnitely lived worker confronts a labor supply indivisibility, chooses when to work, and smooths consumption by trading a risk-free bond. A schedule maps cumulative time worked into current earnings. With a speciﬁcation of preferences that assures balanced growth, the more elastic are earnings to accumulated working time, the longer is a worker’s career. Negative (positive) unanticipated earnings shocks reduce (increase) the career length of a worker holding positive assets at the time of the shock, while the eﬀects are the opposite for a worker with negative asset holdings. The elasticity of lifetime labor supply is as high as the elasticity of aggregate labor supply in a corresponding employment lottery model. Government provided social security can attenuate responses of career length to earnings proﬁle slope and earnings shocks by creating implicit taxes that induce a worker to retire at an oﬃcial retirement age.