i am positive that you contributed correctly, however i am a bit lost on why the run times are different... are they both the same or is one ntsc and one pal?

If the Blu-Ray is 24 frames per second, that's NTSC speed and would explain the difference in runtime vs. the PAL dvd. PAL runs at 29.9 fps.

Quoting ya_shin:

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Quoting bigdaddyhorse:

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If the Blu-Ray is 24 frames per second, that's NTSC speed and would explain the difference in runtime vs. the PAL dvd. PAL runs at 29.9 fps.

I have no real insights into this, but I remember this as follows:
NTSC: around 30 frames per second, based on 60Hz frequency
PAL: around 25 frames per second, based on 50Hz frequency

The Blu Ray plays at 24 frames per second, therefore would be about 4% slower (longer) than the regular DVD.

I had it backward and Ya got it right, except the 24 frames per second would play faster than NTSC, but should be undistingusable from 25 fps PAL. No way does 1 frame per second make for 6 minutes. The mystery continues...

Quoting Mark Harrison:

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The DVD is PAL.  PAL is 4% faster.  That's 5.76 minutes for a 144 minute movie.  That's your difference.

HD DVD and Blu-ray don't have the 4% PAL speedup like DVDs do.  Clearly your DVD is sped up.  The math works out perfectly.  Mystery solved.

Not really. The DVD runtime is 2 hours 18 minutes and 44 seconds. Blu-Ray is 2 hours 24 minutes and 34 seconds. So in my case the BD is sped up, and not the DVD 

Quoting GSyren:

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No, shorter playing time for the DVD means the DVD is sped up.

Thanks for the sanity check.  I was confused for a second there!

Quoting bentyman:

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The DVD is Pal and Blu-Ray is..well, blu-ray. AFAIK there is no ntsc/pal on blu-ray and hd-dvd. Just 1080p/24hz(fps) so the timedifference is a mystery to me for now...

The correct answer was given, just to clear things up a bit:
The effect is usually called PAL speed-up and is a bane for all european dvd-watchers.
Although americans are stricken with 3:2 pulldown on NTSC-DVDs(*), so we are about even. 
With HD DVD and BluRay the movie finally can be watched with 24 pictures per second as intended. Or, even better if it is shot with, say 60fps on a digicam that also could be shown on HDTV-equipment without any prior conversion. Movie aficionados heaven.

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NTSC: around 30 frames per second, based on 60Hz frequency
PAL: around 25 frames per second, based on 50Hz frequency

NTSC: 59,94 fields per second respectively 29,97 frames (or pictures) per second
PAL: 50 fields per second, 25 frames per second
The odd frequency for NTSC derives from the method of color-encoding NTSC uses. Grossly simplified: to push in the extra color information into the previous black and white NTSC-picture they "compressed" the 30fps into 29.97fps thus having a bit more space.
PAL uses a totally different (an superior ) method(**) that had color from the start, so they didn't have to manipulate the framerate.

cya, Mithi

(*) yes I'm aware that there is no such thing as a NTSC-DVD, but "DVD with a resolution of 480 lines and a frequency of 29,97 fps" might be a bit to complicated for starters
(**) and yes I'm also aware that PAL is roughly 20 years younger, so they had ample time to learn from the shortcomings of NTSC.

Quoting GSyren:

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Quoting bentyman:

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Quoting Mark Harrison:

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The DVD is PAL.  PAL is 4% faster.  That's 5.76 minutes for a 144 minute movie.  That's your difference.

HD DVD and Blu-ray don't have the 4% PAL speedup like DVDs do.  Clearly your DVD is sped up.  The math works out perfectly.  Mystery solved.

Not really. The DVD runtime is 2 hours 18 minutes and 44 seconds. Blu-Ray is 2 hours 24 minutes and 34 seconds. So in my case the BD is sped up, and not the DVD 

No, shorter playing time for the DVD means the DVD is sped up.

Of course Mark is right. I wrote this at late night/early morning so I mixed it all up . The PAL dvd want to get finish faster than the BD