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答えの部分はここですね。

Here’s what happened. The speaker before Levitt was, as some of you surmised, putting the audience to sleep. So what’d the conference organizer do? He adjusted the speed of the countdown clock. When you’re giving a lecture on a big stage, there’s usually an electronic countdown clock on a video monitor that tells you how much time you’ve got left. If you’re giving a 60-minute talk, for instance, it might count down in 5-minute increments and then go into second mode after that. In this case, the organizer sped up the previous speaker’s countdown clock by about 30%, which meant that the speaker thought he was speaking for the entire 60 minutes but in fact gave a much shorter speech. In the meantime, the conference organizer summoned Levitt to arrive early to begin right after the previous speaker’s talk.

ようするに「主催者側が時計のすすむ速度を速めた」ためが事の真相のようです。