14 applins with 4 lure modules (30mn). Meaning about 3-4 applins per lure as a FTP player

This means if you want 600 candies. Worst case you need to do about 16-17 lures given you only get 12 candy per applin.
You can increase the amount of candy with silver pineapple and mega mons, but just going off a FTP basis