Timeboxing is the practice of ending a meeting exactly on time regardless of the state of discussion or the desire of participants. In Scrum, the length of the Sprint Planning Meeting is determined by the length of the Sprint. For example, a one week long Sprint has a Sprint Planning Meeting that is timeboxed to two hours. It is acceptable for the meeting to take less time, but not more. A two week long Sprint has a Sprint Planning Meeting that is timeboxed to four hours. Keeping the Sprint Planning Meeting timeboxed has two beneficial effects: one, the team keeps the overhead dedicated to meetings to a relatively low level, and two, the team learns to do effective planning in a very short period of time. If the meeting is not timeboxed, then typically the team will keep planning until the plan is “done” which usually substantially eats into work time.
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Another thing that happens when teams run over the timebox is that they ending up planning for more work than they can get done in a Sprint. On the other hand, if the team finishes its plan for the Sprint before the timebox ends, then the meeting ends early. In other words, the team only plans for one Sprint at a time.
If Sprint planning is defined for 2 hours for the 1-month sprint, will it break Scrum rule?
If it is less than the allotted time, that is acceptable.