'Hour' in the Bible

By this time it was late; so His disciples came to Him, and said, "This is a lonely place, and the hour is now late:

So He came into Jerusalem and into the Temple; and after looking round upon everything there, the hour being now late He went out to Bethany with the Twelve.

Then He came and found them asleep, and He said to Peter, "Simon, are you asleep? Had you not strength to keep awake a single hour?

A third time He came, and then He said, "Sleep on and rest. Enough! the hour has come. Even now they are betraying the Son of Man into the hands of sinful men.