What time did the woman have to see Bob’s teacher?

M: I went downtown at 8:30 yesterday morning, and I didn’t come back to see Bob off to school.
W: I went to Bob’s school at 5:20 because I had an important appointment with Bob’s teacher at 5:30.

W: Did you visit the Television Tower when you had your vacation in Shanghai last summer?
M: I couldn’t make it last June. But I finally visited it two months later. I plan to visit it again sometime next year.