The timeline for completing a project with an AngularJS development agency depends on the complexity and scope of the application. For smaller, less complex projects, development can take as little as a few weeks. However, more extensive applications with advanced features may take several months. An AngularJS development agency typically begins by creating a project roadmap with milestones and deadlines, ensuring transparency and keeping the project on track. Regular communication between the agency and the client also helps in making timely adjustments to the project timeline as needed, based on evolving requirements or feedback.