24 is the minimum number, 33 is the target number, there are currently 31 active, and 9 in testing/reserve some of which could be activated if need be. (accord

24 is the minimum number, 33 is the target number, there are currently 31 active, and 9 in testing/reserve some of which could be activated if need be. (according to Wikipedia, this discussion got me to read more about it)