The value defines the spacing between each baluster instance inserted in the excess length. 
   Namespace:   Autodesk.Revit.DB.Architecture  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 19.0.0.0 (19.0.0.405) 
  Since:  2019 
Syntax
Remarks
 The spacing is used only if a baluster family is set to excess length fill. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentOutOfRangeException | When setting this property: The given value for excessLengthFillSpacing must be between 0 and 30000 feet. |