Well as a format Blu-ray is just a fraction slower than DVD and film.
So the theatrical cut of the Blu-ray is 9 seconds longer than the DVD, despite being the exact same cut.
It's the same for all movies, put in a copy of any movie--even ones that came out same day like when Iron Man 3 comes out. The Blu-ray will be 8 to 10 seconds longer than either the movie in theater or the DVD that comes out the same day.
Hopefully 8 to 10 seconds is below your threshold for ruining the pacing!
I would disagree that blu-ray will only be 8-10 seconds longer than a DVD.
I would say blu-ray is about 4% longer than DVD.
Though that might only be PAL regions. NTSC regions might be different.