docs: def len(self,resolution=1.0,units=None,conversion_function=convert_time, end_at_end=True):
          """
              Calculates the length of the Label Dimension from its minimum, maximum and wether it is discrete.
  
              `resolution`: 
              `units`: output units 
              `conversion_function`: 
              `end_at_end`: additional switch for continuous behaviour
          """
          if units is not None:
              resolution = conversion_function(resolution,from_units=units,to_units=self.units)
          else:
              units = self.units
          if self.min is None:
              return int(self.max / resolution)
          if self.max is None:
              return 0
          if units != '1' and end_at_end:
              return int(np.ceil((self.max - self.min) / resolution))
          return int(np.ceil((self.max - self.min) / resolution) + 1)