CUSTOMER: I just downloaded your upgrade to Nifty Doorways 99, the 99.9 update, and I’m having a problem.
ALEX: All right. What seems to be the problem, sir?
CUSTOMER: Well. The problem is that it’s been a few hours since this “update” started and it doesn’t seem to have stopped.
ALEX: Oh, well, it’s only been a few hours, there’s no need for alarm.
CUSTOMER: When will I need to be alarmed?
ALEX: When it moves from “for a few hours” to “for a while now” you should definitely call back.