With some very extenuating circumstances, I was able to cast 4 molds 16 times each in a 24 hour period.

The circumstances were I was sitting with my oldest boy in the hospital three days after he was struck by a car. He has recovered and is doing well, but the first couple of days they had him under heavy sedation, so i had to find something to keep my hands busy. I probably could have done another five casts or so within the 24 hours, but I ran out of Merlin's Magic at 9 pm.