What is the earliest possible completion time for a job whose order-requirement digraph is shown below? 
Definitions:
Focal Person
An individual at the center of attention within a specific context or scenario, often due to their role, actions, or the significance of their contributions.
Boundary Role Conflict
A situation where individuals face expectations from multiple roles they occupy, which may conflict with each other, especially in organizational settings.
Labour Relations
The study and practice of managing relationships between employers and employees, often focusing on collective bargaining, worker rights, and dispute resolution.
Emergent Role
A role that is not officially designated but develops naturally based on group dynamics and individual strengths within a team.
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