Nearly 3 years ago May 2012, when I was a rookie, it felt unreal. I was the youngest one on the team, 19 and a sophomore in college. I didn't know what it was like to be a professional so this caused confrontation and delinquencies.
Presumably, the idea of an elevator speech is that 30 seconds is the time it takes to hold someone "captivated" as they wait for their destination. Elevator speeches came before Twitter, and as such, are a form of an in-person tweet.