You have 2 options to schedule a task:
Planning in the "What" tab/view
Go to the detail panel of a task by clicking on the relevant task, then click on the "When" tab. You can enter a start date and/or end date or duration for a business project. The duration is calculated automatically if the dates are filled in and it is not modifiable in a personal project.
The duration is displayed in days if you did not enter any start and end times and it will shift to hours if you enter a time for the start and end date.
You can also enter a duration without selecting a date.
Note 1: It is possible to set up a reminder by selecting a value from the "Reminder" list of values if you have set a start and/or end date.
Note 2: You can also create a milestone task: this is an important task that indicates a deadline. The tasks associated with it can not exceed it.
Planning in the "When" tab/view
Directly schedule the task on the timeline of the "When" view of the project by clicking on the schedule in front of the task in question. You can resize the task, enlarging it or decreasing, it by clicking on its ends.
The duration will be in days or hours depending on the time scale of your schedule (zoom level).
To add planning details, simply click on the scheduled task.