There are multiple ways to change the duration of the project.Change the project duration through Project SettingsOpen the project settings and choose the new desired start and end date:Note: in case the new project duration is longer than the original one - we'll shift the planned effort to the new period. In case the new duration is shorter - we'll notify you of the planned effort that will be lost as a result of the changeChange the project duration by adding more time in the People tabWhen you are viewing the People tab on the project and have expanded the schedule, you can add more time to your project:Tip: any duration change is version-specific. This allows you to experiment with different schedules when creating alternative estimates.