In short, these findings exemplify James's observation that the duration of a past experience seems to increase with the number of things that occurred. As James also observed, however, estimates of an experience's duration at the time it occurs seem to be a function of the amount of “empty space”. That is, estimates should be greater when the number of events that occur is small. Time seems to drag when nothing is going on but flies by when we are having fun (Kellaris & Kent, 1992).