Refillable Oil Lamps Set of 3 Frosted Glass Liquid Wax Candle Refillable Frosted Glass Oil Lamp. Measures 2.5 inches wide. Comes with 3" cotton wick Burn Time: Approx. 12 Hours or Longer. Burn time varies depending on fuel and height of wick. For a small flame, adjust to a short wick height. For a larger flame, extend wick height to be equal to the width of a pencil. Lamp Oil is not included but can be purchased at any hardware store, home improvement store, Target or Wal-Mart Each lamp holds about 2oz of oil. Use a small squeeze bottle to pour oil into lamp.