Why is the USA running time listed for a film sometimes different from the running time listed for another country and/or for the video?
A typical feature film is shot and projected at 24 frames per second. The
two main video standards in the US (NTSC) and in Europe (PAL) use different
frame rates (29.97 frames per second vs. 25 frames per second), which
usually means that the film has to be sped up when transferred to video to
avoid image synchronization problems. In the case of a PAL transfer, this
acceleration results in a 4% decrease in the film's total running time. In
other words, the European VHS tape or DVD of a 100-minutes theatrical
release will only be 96 minutes long. Other changes in running time may be
caused by cuts or alterations imposed by local censorship rules or other
minor changes between different releases of the film (such as shorter/longer
end titles, distributor's logos, copyright notices and various supplemental
material).