AbstractTwo experiments investigated the effect of actual event duration and event memory on the retrospective estimation of public event duration. Experiment 1 provided a typicality score for each of 20 public events. The typicality score represents the degree to which the event's actual duration deviates from the typical duration of its category. Subjects in Experiment 2 estimated the duration of the events used in Experiment 1 and indicated whether they remembered the events. Typicality scores were found to be highly correlated with estimation accuracy, and to predict whether event duration was under‐ or over‐estimated. Remembering an event slightly increased estimation accuracy. The results are discussed in terms of their implications for the assessment of eyewitness retrospective duration estimation abilities, and the reconstructive model of retrospective duration estimation proposed by Burt and Kemp (19