Within Teamwork Projects you can add estimated time to tasks in a number of ways.
In the tasks area of each project, when you hover over each task you'll see a + icon to the far right of the screen. Click this to directly add estimated time to the associated task:
You will then have the option to add the estimated time towards that task:
Alternatively, when creating or editing a task, select the progress and time tab, here you can enter the estimated time against the task:
Viewing estimated time on tasks
When you've added estimated time to tasks, you'll see it in a number of places within the project.
To the far right of the associated task, when viewing a task list:
In the task details page, to the far right of the task name:
You can also see estimated time totals for all tasks in the list at the bottom right of each task list.
In the time area of that project, you'll see total estimated time for that project within the left pane:
You can also see estimated time included in task list reports, project reports, the Everything > All Time area and the Workload view.
Note: You can also include estimated time when you're importing tasks using the Excel upload option.
For more information, see: Logging time in the time area of a project