twelve o'clock
`` And the rest will be easier . '' Twenty minutes later Dave Darrin join them . `` I 've passed -- that part of the trial , '' he proclaimed . `` Then , until twelve o'clock , there 's nothing to do but go out and kill time , '' declared Reade . `` Twelve o'clock '' repeated Dick . `` You mean one o'clock . '' `` I mean twelve , '' retorted Tom , with emphasis .