Xenosaga
You might notice a trend of JRPGs and long cutscenes, and the Xeno games (i.e. Xenogears, Xenosaga, Xenoblade) always have incredibly long and dense stories. Xenosaga is the most extreme of them all, though, looping in tons of religious and philosophical themes to make for one convoluted, but absolutely fascinating story.
Each of the Xenosaga games are incredibly heavy on cutscenes, with the story really taking center stage over the gameplay, at least in the first two games. All in all, the cutscenes in the first Xenosaga come out at just over 7 hours.
What’s even more fun, however, is that the first game has a cutscene that’s so long the game actually asks you to save halfway through it, before jumping right back in. At least the game had the sense to let you take a break.