Why does the man want an early appointment?

M: I have to have an appointment first thing in the morning. The doctor wants to do me tests and
I mustn’t eat for twelve hours before that. I’m right, aren’t I?
W: Yes. She said the best way is to go without breakfast and come in early.
M: Yeah. Then I can have a snack and not miss too much time at work.

M: Aha, Linda. Thank you for doing this. The student intake this semester is twice as many as expected. Over 100. Only about 30 last year. I couldn’t possibly take them all round the university campus myself.
W: No problem, Ron. I’m glad to help out. How are we going to do it?
M: Well, I thought I’d split the students into two groups—A and B—and go in opposite directions...