We have released an optimization of the working week setting. Now you can configure variable daily plan hours for your staff for part time and full time tracking modes. When you create a new user or add a new period the terms screen lets you update the defaulted 5 day working week to your preference. See below illustration of the new selectable plan hours.
For more detail check out this article on working week settings.
Not sure what this is all about check out the quick reference video on creating your users as follows: