If you are triggering the Start/Stop times manually insert a couple of Command Buttons into your spreadsheet and use the click event procedures to paste the system time into the cells.
Ex

Private Sub cmdStart_Click() 'This would paste the same start time into all 5 start cell
Range("C4:C8").Value = No
End Su

Private Sub cmdStop_Click() 'This would paste the stop time into a single cel
Range("D4").Value = Now ' You would have to have an individual button for each stop cel
End Su

Private Sub cmdStop_Click() 'This would use a single button to cycle through all 5 stop cell
If cmdStop.Caption = "Stop " & 1 Then 'Be sure to put the caption "Stop 1" on this buttons propertie
Range("B3").Value = No
cmdStop.Caption = "Stop " &
ElseIf cmdStop.Caption = "Stop " & 2 The
Range("B4").Value = No
cmdStop.Caption = "Stop " &
ElseIf cmdStop.Caption = "Stop " & 3 The
Range("B5").Value = No
cmdStop.Caption = "Stop " &
ElseIf cmdStop.Caption = "Stop " & 4 The
Range("B6").Value = No
cmdStop.Caption = "Stop " &
ElseIf cmdStop.Caption = "Stop " & 5 The
Range("B7").Value = No
cmdStop.Caption = "Stop " &
End I
End Su

To see the elapsed time, add a formula in another cell. ex.(=D4-C4
Be sure to format your cells for time

hope this helps