How long was Dilys late?

M: Dilys, I told you to be here at 700 o’clock, but it’s 830 now. Why were you late today
W: I overslept and missed the bus.

M: How about seeing a film this evening
W: When
M: It begins at 715. We’d better get there at 650.
W: Oh, sorry. My mother will leave for London this evening. I’m seeing her off at 700 o’clock.