'Hour' in the Bible

"But as for that day or hour no one knows it -- neither the angels in heaven, nor the Son -- except the Father.

Going a little farther, he threw himself to the ground and prayed that if it were possible the hour would pass from him.

Then he came and found them sleeping, and said to Peter, "Simon, are you sleeping? Couldn't you stay awake for one hour?

He came a third time and said to them, "Are you still sleeping and resting? Enough of that! The hour has come. Look, the Son of Man is betrayed into the hands of sinners.