six o'clock
He had to spring to his feet , and to bail away with one hand while he held the tiller with the other . He would not venture to sit down again ; indeed , the high , green , rolling , froth-topped seas , by which he was surrounded , were sufficient to keep him awake . At last , putting down the skid , he looked at his watch . It was past six o'clock . David had slept more than his allotted hour , and yet he could scarcely bring himself to awake him . `` Poor fellow , he is not so accustomed to this sort of work as I am , '' he said to himself . `` After that long swim , too , he requires rest , and had it not been for his courage I should no longer have been in this world .