about four o'clock
`` Can you tell me what time it is ? '' she asked , falteringly . `` I left my watch at the hotel . '' `` I have n't a watch ; but I think it must be about four o'clock -- it was half-past three when I left school , by the school clock ; I am not sure it was just right . '' `` Thank you . '' She looked at her horse . `` I must get back to the hotel .