If you don't really know why, a good starting point is the 1992 film starring Denzel Washington (Gladiator II). An epic in many senses, the movie clocks in at 3 hours and 22 minutes, and it's also ...

Throughout the span of Denzel Washington ... understand?" Washington said. "Or not, or not! We can do it another way. I can do it both ways, y'all," he added before walking inside.