A:Housekeeping , may I come in ? B: Come in please . A: Good coming , sir . May I do your room now ? B: How long will it take ? A: Your room will be ready in half an hour . B: Well , would you please come back <MASK> ? We are to visit the Tower . A: Of course , sir . Have a good day .
fifteen minutes later 10 seconds later 12 hours later