At first, I placed the candle in an enclosed lantern type candle holder with a small opening at the top, and the candles were not lasting long - they also dripped around the base of the candle towards the end of their burn time; which by the way, burn time was around 3 hours and not 8 hours.
This morning, I decided to just place the candle on a dinner type candle holder which has allowed the candle to burn freely and exposed to the open air (without an enclosure)! This seems to be working but it has only been burning for approximately 2 hours and it looks like it might last another 2 hours and so I'm guessing these candles are more like 4 hour candles and not 8 hours : ( .