This candle burns 50 hours. I now that seems impossible because most candles made with one wick do not last that long. However, I used this one for at least 5 hours and it barely made a dent in the candle. It definitely burned some but you could hardly tell though.
Here is a photo of the candle before it is lit and to show you how bit it is, making it well worth the money spent on it:
NEST gives you explicit instructions on how to handle your candles with care to make them last longer. Here they are: