16 hours plus. I was using it upright in a water-filled compound bucket pointed at the ceiling. Illuminated one room all night and I could still read by the ambient light before dawn. It made me a LOT more comfortable during the black-out.
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Ive been using my dris1000 as well in the blackout. I taped a water bottle to the end wrapped in paper and then hung it from the ceiling. It makes a great lightbulb. Still no power here.