>>It's related with its width and font I think and the number varies, but it stops soon.
>
>Doesn't seem to care what the font is (keeping the size and style fixed). Try the below:
>
>

>DEFINE CLASS form1 AS FORM
>  AutoCenter=.T.
>  Height = 123
>  Width = 247
>  Caption = "Textbox Length Test"
>  Name = "Form1"
>
>  ADD OBJECT text1 AS textbox WITH ;
>    Height = 24, ;
>    Left = 10, ;
>    SelectOnEntry = .T., ;
>    Top = 29, ;
>    Width = 194, ;
>    Name = "Text1"
>
>  ADD OBJECT cmdchgfont AS commandbutton WITH ;
>    Height = 29, ;
>    Left = 62, ;
>    Top = 71, ;
>    Width = 124, ;
>    Caption = "Change Font", ;
>    Name = "cmdchgfont"
>
>  PROCEDURE cmdchgfont.Click
>    LOCAL lcFont AS String
>    lcFont = GETFONT(thisform.Text1.FontName)
>    IF !EMPTY(lcFont)
>       thisform.Text1.FontName = GETWORDNUM(lcFont,1,",")
>    ENDIF
>  ENDPROC
>ENDDEFINE
>

>
>On my PC (with VFP9 SP1), I can enter only 36 characters. Changing the font does not affect the length.

Yes,
It was a wild guess of the reason:)
Cetin