Need Formula to populate a cell +9 hours

Very new to excel programming and 1st post here.
The attached workbook has some examples.
I have inserted the drop-down time lists to choose Actual Start Time & End Time.
30 minutes have been deducted for the employee's lunch period, to show Total Hours Worked.
I need a formula to add 9 hours time to cell H13 from the time in cell E13.
In our company, if an employee works more than 15 hours continuously the employee is entitiled to a 9 hour rest period.

example:

 B13                  E13                    G13                       H13
Actual Start Time    End Time      Total Hours Worked       Change Of Start Time
       7:00 AM          23:30                   16.0                  8:30 AM

If possible, could the formula populate the word NO in the Change Of Start Time cell, if the criteria (15.1)hours was not achieveed in cell G13?
example

  B13                   E13                    G13                              H13
Actual Start Time    End Time      Total Hours Worked       Change Of Start Time
        7:00 AM           22:30                    15.0                NO

Every 6 minutes is a point.

Thank You,

KDL