docs: 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