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Timebox is an essential concept in Scrum. It is our way of staying focused and getting things done in an ever-changing environment. A timebox has a maximum duration in which we freeze the target and work on certain tasks or objectives.

The duration of a timeboxed Sprint should be agreed upon and fixed. We are free to change the duration based on lessons learned, but not frequently, and never based on single occasions. For example, we are not allowed to say that “we have a lot to do this time, so let’s increase the duration for this particular case”. What we are allowed to say is “based on the previous ten Sprints, we’ve realized that the duration of our Sprints is unsuitable, and a 30% increase in duration might better fit our needs. So, let’s increase it from now on”.

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