填空题

You will see a new doctor in a hospital near London if you go there. He is very clever but never speaks. And he didn’t go to medical school. He can work 24 hours a day and never gets tired. He is one meter tall and has a face like a TV screen. Can you guess who he is He is Dr. Robot.
Doctors often need to ask their patients many questions. Busy doctors can only spend a few minutes with each patient. But Dr. Robot can ask a patient questions for an hour if it is necessary. With the help of Dr. Robot, a human doctor can have a lot of useful information when he examines his patient. How can Dr. Robot do this A computer ’tells’ him what to do.

How many hours can he work a day
() hours.