eight o'clock
The nurse says she can do with only four hours ' sleep , and I can see to Olga that little time . '' `` No , '' Elizabeth said decidedly , `` no , Lizette , you have your work at the shop and the cooking . You must n't do more than that . I can come after supper -- at eight o'clock -- and stay till twelve -- '' `` You could n't go home all alone at midnight -- you know you could n't , '' Sadie interrupted . `` I need n't to . I could sleep in a chair till morning . '' `` As to that , you could sleep on the nurse 's cot , I guess , '' Lizette admitted .