How many days will the woman be traveling?

W: When do you leave for holiday?
M: On the twentieth. We’re flying. The flight takes seven and a half hours.
W: And when are you back?
M：On the twenty-eighth. I will give you a ring when we’re back.

M: Hi. Sarah. Come and have a look at my new MP3 player.
W: It’s wonderful. Did you get it from your parents as a birthday gift?
M: My mom bought me this, and my father gave me a pair of sporty shoes.
W: How lucky you are!