Special equipment: an 8-inch square baking dish
Combine the cream, sweetened condensed milk and vanilla extract in a large bowl. Beat with a hand mixer until double in volume, about 4 minutes.
Spread a scant 2 cups of cream in an 8-inch square baking dish, followed by 1/2 cup graham cracker crumbs and a third of the mangoes. Continue alternating layers for a total of 9 layers, ending with mango. Chill at least 8 hours and up to overnight.
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