midnight
Let 's start and pick them up where we find them . '' `` True enough , '' answered Ned . `` The way the engine is working , in this light favoring wind , we ought to make eighteen miles an hour anyway . If we leave at midnight , by five o'clock in the morning we can be ninety miles north . The only trouble is in the handling of the bag . It 's going to take at least twenty men to move the inflated bag from the retaining weights to the car and we ca n't make the rigging fast in the dark . We 'd better begin work at four o'clock to-morrow morning , as soon as it begins to be light , and get away about two in the afternoon .