The billable hour was never a measurement. It was a grammar, and the machine is only changing its units. AI was supposed to kill the billable hour. The argument writes itself. When a research memo that took thirty associate hours takes ninety minutes of machine time, billing by the hour becomes either absurd or dishonest. Absurd if the firm bills ninety minutes for work it once sold for thirty hours. Dishonest if it bills thirty hours anyway. So the hour must die, and firms must flee to flat fe