Decisions over the timing of actions are critical in several safety, security and healthcare scenarios. These decisions, similar to discrete decisions, can be influenced by biases and individual traits. In this paper, a bias of impatience is studied in an experiment with 626 participants, with a focus on gender differences. Impatience was moderated with a manipulation of a variable-speed countdown. Men and women differed in how they expressed impatience. While men systematically and irrationally act earlier when become impatient following the slower countdowns, women react by irrationally requesting earlier information about the outcome of each trial, and impulsively pressing an inactive key.