"Forty more days and Nineveh will be overturned!" This pagan city's response: "And the Ninevites believed God. They proclaimed a fast and dressed in sackcloth, from the greatest of them to the least" (Jonah 3:5). Because of their faith, God spared their nation."
I don't think we are going to be that lucky, even if we could get everyone to dress in sackcloth, which we can't.
But we are so darn close!