Previous research suggests that when trained in a symbolic choice-matching task involving a short (e.g., 2 s) and a long (e.g., 8 s) sample, naive pigeons represent sample duration analogically. To assess whether either a substantial wait time before a sample can be identified or high sample discriminability is necessary to the occurrence of analogical coding of duration, samples that could be quickly identified (.5 and 2 s) and difficult to discriminate samples (2 and 3 s) were employed. A retention test revealed a choose-short effect in both cases, suggesting that neither a substantial wait time before a sample can be identified nor high sample discriminability is necessary to the occurrence of analogical coding of event duration. The temporally extended and cumulative nature of duration may promote the analogical representation of event duration.