Three times
2 Kings 13:18
And he said, "Take the arrows"; and he took them. And he said to the king of Israel, "Strike the ground with them"; and he struck three times, and stopped.
2 Kings 13:19
Then the man of God was angry with him, and said, "You should have struck five or six times; then you would have struck down Syria until you had made an end of it, but now you will strike down Syria only three times."