At the project level, it is possible to specify whether or not work will be performed over weekends. This is done through the “Task Dependencies” section in Project Tab > Edit Project page. When “Including Weekends” is selected, Estimated Hours allocated on all tasks in the project will be spread out evenly from the Estimated Start Date to the Estimated End Date of the task, weekends included.
On the other hand, if “Excluding Weekends” is selected at the project level, it is still possible to specify that work will be done over weekends on a per task basis. Therefore, if the “Weekends Allowed” checkbox is checked, AceProject will allocate hours of work on weekends for the given task if the timeline of the task includes weekends.