one o'clock
`` Joan 's twelve-hour time limit in Arret will expire at one o'clock tomorrow morning . '' Powell reminded Marlowe . `` That gives me nearly six hours in which to find her and equip her with a Silver Belt . You will broadcast the recall wave at exactly one o'clock . If I have n't succeeded in finding Joan by then , I 'll discard my own Belt and stay on over there in Arret with her ... . I 'm ready to start now , whenever you are . '' Benjamin Marlowe raised his hand to the switch in the projector 's control panel .