eleven o'clock
You understand thoroughly , do you ? '' `` Yes , '' said Jack , quietly . `` When are you going to start ? '' `` There 's no use going up much before eleven o'clock , '' said Harry . `` Before that we 'd be seen , and , besides , if a Zeppelin is coming , it would n't be until after that . My plan is to scout to the east and try to pick her up and watch her descend . I think I know just about where she 'll land -- the only place where there 's room for her .