Not sure where you are getting the 28 from but:
24 - max part name
24 - max variable name
14 - max trace name
14 - max trace value
Anything longer will be truncated to this length.
Not sure where you are getting the 28 from but:
24 - max part name
24 - max variable name
14 - max trace name
14 - max trace value
Anything longer will be truncated to this length.