'Hours' in the Bible

Then Jesus said in answer, Are there not twelve hours in the day? A man may go about in the day without falling, because he sees the light of this world.

And about three hours after, his wife, having no knowledge of what had taken place, came in.

But when they saw that he was a Jew, all of them with one voice went on crying out for about two hours, Great is Diana of Ephesus.