'Within' in the Bible

While Israel lived in Heshbon and its villages, and in Aroer and its villages, and in all the cities that are on the banks of the Arnon, three hundred years, why did you not recover them within that time?

Then Samson said to them, “Let me now propound a riddle to you; if you will indeed tell it to me within the seven days of the feast, and find it out, then I will give you thirty linen wraps and thirty changes of clothes.