Does Videogame Length Vary By Territory?

asphyxiation_query writes "I've been looking at the relative length of videogames (in terms of overall gameplay, how long the game stretches out from start to completion) based on region. Can Slashdot Games readers discern any obvious regional patterns or variations in this information? For example, are games from Korea typically longer than Japanese? How do European and North American titles stack up in this respect?" Or is content similarly long if part of the same genre, regardless of country of origin?