docs: def timedelta_to_days(td):
      """
      Convert a `datetime.timedelta` object to a total number of days.
  
      Parameters
      ----------
      td : `datetime.timedelta` instance
  
      Returns
      -------
      days : float
          Total number of days in the `datetime.timedelta` object.
  
      Examples
      --------
      >>> td = datetime.timedelta(4.5)
      >>> td
      datetime.timedelta(4, 43200)
      >>> timedelta_to_days(td)
      4.5
  
      """
      seconds_in_day = 24. * 3600.
  
      days = td.days + (td.seconds + (td.microseconds * 10.e6)) / seconds_in_day
  
      return days