Three Wicks are available in two sizes and soon I will be adding a third size.  The last a long time and smell wonderful.  Be prepared to devote care to a three wick the first time burning should be around 6 hours or until the top completely liquifies.  You should always hug and roll your three wick gently to keep the even burning as necessary.  Also always trim wicks to 1/4" before lighting and if need be reposition your wick to ensure even consistancy.  If you do not have a three wick holder you can use a plate or a old pie pan to set it in.  I use my old pie plates they work great.