If you watch the video, all teams were handed the envelop at the start of the week in class. They were allowed to think an form a business plan as long as they liked. They didn't know how much was in the envelop. Once they opened the envelop, they had 2 hours to make money.
Exactly. They weren't told they must open the envelope. The last team figured this out and (presumably) timed it so that their 2 hours coincided with the 3 minute presentation time.
