i have 41 slots. I don't know how you unlock extra slots else of for every Job/Class you get. And you are wrong in 1 point there are 23 Classes out there but 1 Class splits into 2 Jobs so in Jobs there is 1 more.
Would be nice to know how to unlock all slots and what is the max. Cause i have all classes/Jobs but i missed 1 slot it seems.^^