週末と祝日を除く、指定された 2 つの日付間の作業時間数 (午前 8 時から午後 8 時) を計算していますが、コードの構文が正しくありません。
サンプルデータ:
開始日: 2011/06/17 08:00:00 AM
終了日: 2011/06/19 08:00:00 PM
Sub SLA_Days_Resolved_F()
    Dim x As Integer
    ' Set numrows = number of rows of data.
    NumRows = Range("F2", Range("F2").End(xlDown)).Rows.Count
    Dim total As Integer 'to count the total hours
    Dim st As String 'start date cell
    Dim en As String 'end date cell
    Dim destCell As String
    Dim d As Date ' for the loop
    total = 0
    ' Establish "For" loop to loop "numrows" number of times.
    For x = 2 To NumRows + 1
        st = "G" & CStr(x) 'reference to the cells
        en = "D" & CStr(x)
        'loop from start date to end date
        For d = Date(Range(st)) To Date(Range(en))
            'check if the current date is found is a Public holiday in the range or if a weekend
            If ((Vlookup(d,lookups!$o$3:$p$26,2,false))=1) or (weekend(d))Then
                'minus 8 to remove hours before 8am.
                total = (total + Hour(d) + minutes(d) / 60) - 8
            End If
        Next
    Next
End Sub