about one o'clock
If what the boys had only guessed at were true -- that one or both of the men contemplated giving a signal to the enemy by means of the flashlight -- the time for it had not yet come . `` Well , I 'll try my hand , '' Blake said . `` You turn in , Mac , and if I need any help I 'll call you . If I do n't see anything up to about one o'clock I 'll let Joe do his trick . Good-night and pleasant dreams . '' Charlie did not answer . He was already in his bunk and asleep , for he was tired , and the last half hour of his watch he had kept himself awake with difficulty .