Returns the total time taken across all results.
        
        :rtype: float

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