Hours in the Bible

John 11:9 Jesus answered, Are there not twelve hours in the day? If any man walk in the day, he stumbleth not, because he seeth the light of this world.
Matthew 20:3-12 And he went out about the third hour, and saw others standing idle in the marketplace, 4 And said unto them; Go ye also into the vineyard, and whatsoever is right I will give you. And they went their way. 5 Again he went out about the sixth and ninth hour, and did likewise. 6 And about the eleventh hour he went out, and found others standing idle, and saith unto them, Why stand ye here all the day idle? ...
Matthew 27:45-46 Now from the sixth hour there was darkness over all the land unto the ninth hour. 46 And about the ninth hour Jesus cried with a loud voice, saying, Eli, Eli, lama sabachthani? that is to say, My God, my God, why hast thou forsaken me?

Acts 23:23 And he called unto him two centurions, saying, Make ready two hundred soldiers to go to Caesarea, and horsemen threescore and ten, and spearmen two hundred, at the third hour of the night;

SYMBOLICAL

Revelation 8:1 And when he had opened the seventh seal, there was silence in heaven about the space of half an hour.
Revelation 9:15 And the four angels were loosed, which were prepared for an hour, and a day, and a month, and a year, for to slay the third part of men.