A Better Tomorrow (1986) is often cited as the progenitor of the 1980s heroic bloodshed cycle that set the template for the films to come later in the production trend.
Category: Hong Kong
Once Upon a Time in China (1991)
The final act action sequence in Once Upon a Time in China (1991) runs close to 30 minutes in length, and takes up 93% of the fourth act of the film.