Explanation/Reference:
Reference https://link.springer.com/chapter/10.1007/978-3-319-23000-9_4

The PRINCE2 principle supported by the setting of tolerances for the three levels of plan (Project, Stage, and Team Plans) is "Manage by exception." This principle allows management to set predefined tolerances for project objectives, and only escalate issues to higher management if these tolerances are exceeded, thereby facilitating efficient use of management time and focus. References: PRINCE2 Foundation manual, PRINCE2 official resources

By organizing a workshop with project stakeholders to define the detailed requirements for project outputs, the team manager is applying the PRINCE2 principle of "Focus on Products." This principle emphasizes that a project's primary focus should be on product definition, delivery, and quality requirements, which are crucial for achieving project success and user satisfaction.References: (PRINCE2 7 Foundation Handbook, AXELOS)

The length of management stages in a PRINCE2project can be influenced by the availability of the project board to review and approve key decisions at stage boundaries. This ensures that stages are planned around when decision-makers can participate and provide necessary guidance or approvals.References: = PRINCE2
7 Foundation handbook and online resources