Team Sky on Tour de France rest day

The video briefly introduces a concept with the phrase 'What's what? 31 now.' It seems to be a part of a larger discussion or lesson, possibly involving numbers or a specific topic that requires further context.

What do you think the phrase 'What's what?' means in this context?

How does the number '31' relate to the phrase mentioned?

What emotions or thoughts might the speaker be expressing with this statement?

In what situations might someone use the phrase 'What's what?'

What could be the significance of the duration '4230' in relation to the statement?