ten o'clock
She scarcely noticed the eager note in his voice . `` That 's an idea ! '' she exclaimed . `` I was wondering what I 'd do about this evening , and I was determined not to go home till ten o'clock . I do n't know why , but if I can make myself stay right away on my own pleasure till then it will be like breaking a spell . But why I 'm talking like this to you I do n't know . You 'll think me mad . ''