A computing device is described that outputs a radial interface. The computing device accesses a list that includes multiple time-based events that have a particular duration. The computing device selects, based on the list and the duration of each time-based event, a subset of time-based events determined such that a sum of the durations for each event in the subset is less than or equal to an hour. An order of the events in the subset is the same as in the list. The computing device generates a graphical user interface that includes a graphical selector and a number of graphical representations equal to the number of events in the subset, each graphical representation corresponding to a different event from the subset, arranged around the selector, and having a size proportional to the duration of the event corresponding to the respective representation. The computing device outputs, for display, the interface.