Sky Lanterns

I am so excited to find these Sky Lanterns, I have wanted some forever since I started seeing these images on Flickr. ! Thank you, Jordan! This is how they work. I am imagining them hovering about 10 feet off the ground in my backyard, although, those instructions say they only burn 4 minutes. Adapt them to have them float around my backyard for an hour, attached to the grapes? Something to think about.