How many plague hearts can be in one map at a time state of decay 2?

Answer : 10 plague hearts are there in one map at a time in state of decay 2

Explanation : The State of Decay 2 consists of 10 Plague Hearts which one needs to destroy and they are placed on randomly dotted areas around the map inside a searchable location on it.

With each heart that one destroys, the remaining other ones become a little bit tougher and are more heavily guarded by the undead people.