eleven o'clock
Gracious , it 's going to feel funny . '' `` After we have disappeared , '' continued the Doctor , `` you will wait , say , until eleven o'clock . Watch the ring carefully -- some of us may have to come back before that time . At eleven o'clock pack up everything '' -- he looked around the littered room with a smile -- `` and take the ring back to the Biological Society . '' `` Keep your eye on it on the way back , '' warned the Very Young Man . `` Suppose we decide to come out some time later to-night -- you ca n't tell . '' `` I 'll watch it all night to-night , here and at the Museum , '' said the Banker , mopping his forehead .