https://github.com/apache/airflow/blob/3a349624a20d3432dc75e337d6ffb1109a50e451/airflow/providers/amazon/aws/operators/athena.py#L49

What is the unit of measurement of time used here?
airflow/providers/amazon/aws/hooks/athena.py
super().__init__(client_type='athena', *args, **kwargs)  
        self.sleep_time = sleep_time
    def run_query(
        self,
        query: str,
        query_context: Dict[str, str],
        result_configuration: Dict[str, Any],
        client_request_token: Optional[str] = None,
        workgroup: str = 'primary',
    ) -> str:
        """
        Run Presto query on athena with provided config and return submitted query_execution_id
        :param query: Presto query to run
        :type query: str
        :param query_context: Context in which query need to be run
        :type query_context: dict
        :param result_configuration: Dict with path to store results in and config related to encryption
        :type result_configuration: dict
        :param client_request_token: Unique token created by user to avoid multiple executions of same query
        :type client_request_token: str
        :param workgroup: Athena workgroup name, when not specified, will be 'primary'
        :type workgroup: str
        :return: str