1. You would need to use worksheet change events and parse it

Private Sub Worksheet_Change(ByVal Target As Range)
Dim part1 As String, part2 As String
On Error GoTo ws_exit:
Application.EnableEvents = False
If Not Intersect(Target, Me.Range("AA1:AA100")) Is Nothing Then
With Target
part1 = Left(.Value, InStr(1, .Value, ".") - 1)
part2 = Right(.Value, Len(.Value) - InStr(1, .Value, "."))
.Value = (Val(part1) * 60 + Val(part2)) / 1200

End With
End If

ws_exit:
Application.EnableEvents = True
End Sub

'This is worksheet event code, which means that it needs to be
'placed in the appropriate worksheet code module, not a standard
'code module. To do this, right-click on the sheet tab, select
'the View Code option from the menu, and paste the code in.



2 =SUMPRODUCT(--(SUBSTITUTE(A2:A3,"L","")))

--

HTH

RP
(remove nothere from the email address if mailing direct)


"J45on" wrote in message
...
1. How do i make excel recognise the format i am using?
The Cell:
A1=1.12.6
to be recognised as 1minute and 12.6 seconds, divided by 1200, thus
A2=0.0605

2. How do i sum the two cell below?
A2=1.6L A3=3 (without L)
that is in total A4=4.6L.