In God's message to Nineveh, He was going to overthrow them in ______ days.

In the Bible, God's message to Nineveh was that He was going to overthrow them in forty days. This message was delivered by the prophet Jonah and was a warning for the people of Nineveh to repent and turn from their wicked ways. The number forty is often used in the Bible to represent a period of testing or judgment, and in this case, it was a time for the people of Nineveh to change their ways and seek forgiveness from God before it was too late. The message had a profound impact on the city, and the people of Nineveh repented, leading to God sparing them from destruction.