Hello Renato,
The total characters include also the "natural" path in the drive, not the DFS Namespace. For example \Myshare may translate to c:\myshare.example\folder1\subfolder2
I would recommend to enable the Long path support if your clients use Windows 10 Version 1607, and Later
https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=cmd
Best regards,