@classmethod
def get_total_time(cls):
    """Returns the total time taken across all results.
        
        :rtype: float
        """
    cur = cls.get_cursor()
    q = 'SELECT SUM(elapsed) FROM {}'
    cur.execute(q.format(cls.meta['table']))
    result = cur.fetchone()['SUM(elapsed)']
    return result if result else 0.0
