Approximate burn times more or less.
   9 oz    45 hours    double wicked for more scenting power!
 18 oz    90 hours   double wicked for more scenting power!
   These are 
realistic estimated burn times not the maximum amount under "PERFECT" conditions. Burn times will vary from scent to scent and according the the consumers burning habits. 
To get the most time out of your candle, follow the burning instructions on the bottom of your candle.
 For more tips click here. 
Burning Tips