What movie is 7 hours long?

I'm curious, what film could possibly stretch out to an astonishing duration of seven hours? It's quite an extraordinary feat for a movie to captivate audiences for such an extended period. Is it a documentary delving into intricate historical events or a sprawling epic tale with multiple intertwining storylines? Could it be a unique art house film pushing the boundaries of cinematic expression? I'm intrigued to know what movie has managed to hold viewers' attention for such a lengthy period.