Studies of judgements of the durations of filled auditory and visual stimuli were reviewed, and some previously-unpublished data were analysed. Data supported several conclusions. Firstly, auditory stimuli have longer subjective durations than visual ones, with visual stimuli commonly being judged as having 80-90% of the duration of auditory ones. Secondly, the effect was multiplicative, with the auditory/visual difference increasing as the intervals became longer. Only a small number of exceptions to both these conclusions were found. Thirdly, differences in variability between judgements of auditory and visual stimuli derived from most procedures were small and sometimes not statistically significant, although differences almost always involved visual stimuli producing more variable judgements. Currently, the most viable explanation of the effects appears to be some sort of pacemaker-counter model with higher pacemaker speed for auditory stimuli, although this approach cannot deal quantitatively with all the findings usually obtained in its present form.