I know it will probably very depending on the type of wax and so on... But, Roughly how many 3x6.5 round flat-top pillars could you get out of a presto-pot full of wax??? If knowing the wax would be more accurate, I'm Planning on using the Ecosoya PB Pillar Blend From Candle Science.... If I decide to start doing this as a hobby... I want to know How many molds to buy... Don't want more than I need... LOL...