Sprint lengths should be chosen in relation to project duration; however, they should never be longer than four weeks. Consider a three-month project. If it has four-week sprints, the stakeholders will only get to participate in two demos before the project is released. This is not enough feedback to mitigate the risks. Shorter sprint lengths are a necessity.
What about a year-long project? Assuming four-week sprints break approximately monthly, that project would offer 11 opportunities (plus the final release) for stakeholders to see the developing product. Four-week sprints are a realistic ...
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