How long has the flight been delayed?

M: I’ve just heard on the radio that all flights from the domestic air terminal will be delayed by two hours.(47)There’s been a security alert(48)and they’re searching all the bags.
W: Oh, no! That’s going to cause us a serious problem. Our clients are expecting us and we won’t be able to make it for the meeting.
M: That shouldn’t be a big problem. I am expecting a call from them this afternoon to talk about the seminar. I’ll see if I can postpone the meeting until tomorrow morning.(49)