'Three day' in the Bible
"The elders of Israel will listen to you, and then you and they are to go to the king of Egypt and say to him, "The LORD God of the Hebrews has met with us. Now, let us take a three-day journey into the desert to sacrifice to the LORD our God.'
Then they said, "The God of the Hebrews has met with us. Please let us go a three-day journey into the desert to offer sacrifices to the LORD our God so he does not strike us with pestilence or sword."
We must go a three-day journey into the desert, and we'll offer sacrifices to the LORD our God just as he has told us."
So they traveled from the mountain of the LORD, a three-day trip, with the Ark of the Covenant of the LORD traveling in front of them a three day trip to explore a place for them to rest.
Now Nineveh was a very large city, requiring a three-day journey to cross through it. As Jonah started into the city on the first day's journey, he proclaimed the message, "40 days more and Nineveh will be overthrown!"