Tasks should get a planned duration. Adding one helps to guess correct durations for tasks. This is an immensely useful skill worth learning.
The information could also be used to give an overview of the workload in the todo list. If you use separate lists for your projects (I would even suggest to rename them to projects) you could add up the durations to get an estimate for the duration of the whole project.
Adding durations for tasks may also help to realize if some due date is not manageable. Displaying a warning for such a problem would be very beneficial.
Tasks should get a planned duration. Adding one helps to guess correct durations for tasks. This is an immensely useful skill worth learning.
The information could also be used to give an overview of the workload in the todo list. If you use separate lists for your projects (I would even suggest to rename them to projects) you could add up the durations to get an estimate for the duration of the whole project.
Adding durations for tasks may also help to realize if some due date is not manageable. Displaying a warning for such a problem would be very beneficial.
You could talk to the guys from https://play.google.com/store/apps/details?id=squirrelinhell.lwpredictions&hl=de to automatically add the durations in this app to their system. LWpredictions seems to be very privacy friendly.