The Crisco Candle is touted to be a very long burning candle (over a month by some estimations). Some try to debunk the method (Snopes). I have not tried this. Survival sites show this option for off the grid/emergency consideration. It seems plausible to me if one considers the history of Crisco and how it all got started…interesting reading. Makes my arteries quake when I consider how much my family used this in lieu of lard while I was growing up.