Runtime differences on DVDs?
I'm looking to buy an old mini-series on DVD. It was released in the USA a few years ago, but it's now out of print (with used copies being sold for around 100 dollars). Thankfully there's also a Region 4 release, which is much cheaper. However, the runtime of that set is very different! 454 minutes versus the 494 minutes on the American release.
Does anyone know what could cause that? I'm familiar with PAL speed-up, but I don't think that's it -- the DVD set states "NTSC", and the time missing is way over 4%. Should I just assume that it's been cut, or is there some other possible reason for this discrepancy?
Thanks in advance for any input!