@Jill Ackerman The difference between the Worker and Planner access level is that Planners can Manage projects (found in Setup > Access Levels) compared to Workers only being able to Contribute to projects. Even if a Worker is setup as the Project Owner, the maximum permission they will receive on a project is Contribute. See the chart here . However, Workers can be granted Manage access on tasks they are assigned to, since the primary responsibility of someone with a Worker license is to get work done. Therefore, if a Worker is assigned as the project owner AND is assigned to every task within the project, he/she will be able to Manage all the tasks. On the other hand, if this Worker is not assigned to every task within the project, he/she will only be able to Contribute to the tasks not assigned to and therefore will not be able to make changes to the task duration, as that falls under Manage permissions. Hope that helps to clear things up. If you have any questions, let me know! Nichole Vargas Customer Programs Specialist, Workfront