def get_full_time_interval(self):
        """Give the full time interval of the file. Note that the real interval
        can be longer because the sound file attached can be longer.

        :returns: Tuple of the form: ``(min_time, max_time)``.
        """
        return (0, 0) if not self.timeslots else\
            (min(self.timeslots.values()), max(self.timeslots.values()))
Give the full time interval of the file. Note that the real interval
        can be longer because the sound file attached can be longer.

        :returns: Tuple of the form: ``(min_time, max_time)``.