'Days' in the Bible

And Jehovah prepared a great fish to swallow up Jonah; and Jonah was in the belly of the fish three days and three nights.

So Jonah arose, and went unto Nineveh, according to the word of Jehovah. Now Nineveh was an exceeding great city, of three days journey.

And Jonah began to enter into the city a day's journey, and he cried, and said, Yet forty days, and Nineveh shall be overthrown.