Final answer:
Sprints are no longer than a month to maintain audience engagement, productivity, and focus while delivering frequent value and receiving timely feedback in Agile project management.
Step-by-step explanation:
The reason the length of a Sprint is no longer than a month is due to the limits of audience engagement over time. Drawing from the provided reference, the impresario in the scenario set a forty-day maximum for the event, beyond which the audience would lose interest.
This principle applies to sprints in project management, specifically in the Agile methodology. A sprint, typically set to one month or less, aims to maintain a high level of productivity and focus, while ensuring that the team delivers value to the customer frequently. If a sprint were to be longer, it could lead to a decline in momentum, increased complexity in managing the sprint, and a longer feedback loop from customers, all of which are critical for the success of an Agile project.