Return the number of characters in S$.
NOTE: A similar function, LenB, returns the number of bytes in the string. For a usertypevar, LenB returns the number of bytes of memory occupied by the variable's data.
Return the number of bytes required to store this user type variable. If the user type has any dynamic String and Variant elements the length returned may not be as big as the actual number of bytes required.
InStr( ), InStrRev( ), Left$( ), Mid$( ), Replace$( ), Right$( ).
Debug.Print Len("Hello") ' 5