four o'clock
`` I know it . Oysters are such slippery old things , even on the half shell , '' returned Arline , who was not specially fond of them . `` Let me see . The girls will be here at four o'clock . We are to have oysters , soup , a meat course , salad and dessert . That makes five different courses in five different houses . It will be eight o'clock before we reach the dessert .