If someone is a skilled human, they can have a fascinating conversation with most people in 2 minutes. I'd look at the creator of Humans of New York as a shining example of how to connect with someone - I'm sure that many of the convos are much longer, but I highly doubt that the first 2 minutes are just talking about the weather.

Of course, not everyone will be open to talking at any given time. And it is probably especially difficult to have a genuine connection in a speed dating context, where the other party is probably posturing in one way or another. If you met them in any other situation, they'd probably be more open/authentic.