four o’clock
` I have decided to invite about twenty people to lunch , ' Richard said . ` Just the members of the committee and a few others . It 'll be better than giving a dinner . Westlake 's lecture will be over by four o'clock , and that allows people to get away in good time . The workmen 's tea will be at half-past five . ' ` You must have refreshments of some kind for casual comers , ' counselled Mrs. Waltham . ` I 've thought of that .