CLEAN : Mutant cats still a draw at Hemingway's virus-hit Florida home

What does the 'duration' value represent in the context of the text?

How might the 'offset' value be used in relation to the 'duration'?

What significance does the '2nd.' text hold in the overall context?

In what scenarios might the 'duration' and 'offset' be important?

Can you explain how the data structure presented might be useful in programming?