Parameters
        ----------
        start_session: pd.Timestamp
            The first session.

        end_session: pd.Timestamp
            The last session.

        Returns
        -------
        int: The total number of minutes for the contiguous chunk of sessions.
             between start_session and end_session, inclusive.

def minutes_count_for_sessions_in_range(self, start_session, end_session):
        """
        Parameters
        ----------
        start_session: pd.Timestamp
            The first session.

        end_session: pd.Timestamp
            The last session.

        Returns
        -------
        int: The total number of minutes for the contiguous chunk of sessions.
             between start_session and end_session, inclusive.
        """
        return int(self._minutes_per_session[start_session:end_session].sum())