'Day's' in the Bible

Now a wind went out from the Lord and brought quail from the sea, and let them fall near the camp, about a day's journey on this side, and about a day's journey on the other side, all around the camp, and about three feet high on the surface of the ground.

while he went a day's journey into the desert. He went and sat down under a shrub and asked the Lord to take his life: "I've had enough! Now, O Lord, take my life. After all, I'm no better than my ancestors."

David left Asaph and his colleagues there before the ark of the Lord's covenant to serve before the ark regularly and fulfill each day's requirements,

When Jonah began to enter the city one day's walk, he announced, "At the end of forty days, Nineveh will be overthrown!"