Managers can choose from several different ways to auto-assign Hours Worked depending on if check-ins have occurred or not. By choosing to Auto-Assign Hours Worked, Managers can eliminate the need for check-ins to occur or to ensure that users are assigned the Hours for their Shift they are scheduled even if they forgot to check out.
The Auto-Assign style can be set in an opportunity’s Controls tab, on the Time Tracking page.If none of the Auto-Assign options are selected, left on Do Not automatically assign Hours Worked, the check-in and out process will determine what hours are assigned to the user.

