How Long to Watch “Red Garden”?

In this dark and strange supernatural thriller, a group of four girls awaken in a haze, none of them able to remember anything but bits and pieces of the night before. The girls can picture little else but a mansion with a swimming pool, but one thing they all see is a strange vision of butterflies that nobody else can perceive. These winged creatures lead the girls to a strange woman, who informs them that they are all, in fact, dead, having been murdered. Now they must do her bidding, which includes turning into killers themselves. She forces the girls to kill mysterious beasts that look like men, and if they don't get to the bottom of the bizarre and hallucinatory dream that their undead lives have become, they could be the woman's murderous slaves forever.