Extracting strings from messy text files

[bat711]

I'm trying to extract the time certain processes are running from log files similar to the attached one. Below is the code I'm using to extract the time in MM:SS format and then creating a running total of all the processes and importing it (code not included) into an access DB. Unfortunately it only works on about 30% of the files because of inconsistent formatting. Right now it is set up to identify the first '?' then the second '?' then find the '/' and extract what is between it (the time). The log file I've attached contains most (if not all) of the different layouts.

Any help greatly appreciated.

Dim strReadLine As String, inTaskMasterSection As Boolean
    Dim pos1, pos2 As Integer, strDate As Date, strSQL As String
    Dim TenCount As Integer, TimeSum As String, Time As String
    Dim junk As Integer, isAS3 As Boolean
 
    Dim Time2 As String
    
    inTaskMasterSection = False
    TenCount = 0
    Time = ""
    TimeSum = ""
    junk = 0
    Time2 = "00:00"
    
    If InStr(1, strFileName, "(AS3)") Then
        isAS3 = True
    Else
        isAS3 = False
    End If
 
Open strFileName For Input As #1
    Do While Not EOF(1)
        Line Input #1, strReadLine
 
        If InStr(1, strReadLine, "Sent:") Then
            pos1 = InStr(1, strReadLine, ",")
            pos2 = Len(strReadLine)
            strDate = Mid(strReadLine, pos1 + 1, pos2 - pos1)
        End If
        
        pos1 = ""
        
        If InStr(1, strReadLine, "S ") Then
            pos1 = InStr(1, strReadLine, "?")
            pos1 = InStr(pos1 + 1, strReadLine, "?") + 1
                        
            Do While Mid(strReadLine, pos1, 1) = " "
                pos1 = pos1 + 1
            Loop
            
            pos2 = InStr(1, strReadLine, "/")
            Time = Mid(strReadLine, pos1, pos2 - pos1)
            'MsgBox (Time)
            'MsgBox (TimeSum)
            
            'Begin Time Sum
            Dim Time1 As String
            
            Dim strParts1() As String
            Dim strParts2() As String
            Dim intSeconds As Integer
            
            Time1 = Time
                        
            strParts1 = Split(Time1, ":")
            strParts2 = Split(Time2, ":")
            
            intSeconds = CInt(strParts1(1)) + CInt(strParts2(1))
            If intSeconds > 59 Then
                Time2 = CInt(strParts1(0)) + CInt(strParts2(0)) _
                + (CInt(strParts1(1)) + CInt(strParts2(1))) \ 60 _
                & ":" & Format((CInt(strParts1(1)) + CInt(strParts2(1))) Mod 60, "00")
            Else
                Time2 = CInt(strParts1(0)) + CInt(strParts2(0)) _
                & ":" & Format((CInt(strParts1(1)) + CInt(strParts2(1))), "00")
            End If
            'MsgBox (Time2)
            'End Time Sum
            
        End If
    Loop
 
    Close #1
    
    TimeSum = Time2