Are there any benefit of working in longer sprints

The best benefits of scrum or agile is in shorter iterations. There are no major advantage of doing longer sprints for most of the teams/products. If teams can do shorter iterations/sprints then they should definitely do it.

Longer sprints might be good for teams

1) who were doing waterfall for long and being transitioned to Agile. A longer sprint will be more suitable for them until they can transition to shorter sprints

2) Products/Teams which doesn't need frequent feedback and can run smoothly . Most of such products/team will have stable backlogs which doesn't change much but then then should have other XP practices ( if they are delivering software products)

3) certain infrastructure /manufacturing projects which needs longer duration to get all the parts working together and other approvals.

But even in manufacturing the final product may take many sprints but it doesn't prevent the team from running small sprints to product the internal components.

even if you start with longer sprints start reducing the sprint duration gradually

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