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/operators/athena.py
self,
        *,
        query: str,
        database: str,
        output_location: str,
        aws_conn_id: str = "aws_default",
        client_request_token: Optional[str] = None,
        workgroup: str = "primary",
        query_execution_context: Optional[Dict[str, str]] = None,
        result_configuration: Optional[Dict[str, Any]] = None,
        sleep_time: int = 30,
        max_tries: Optional[int] = None,
        **kwargs: Any,
    ) -> None:
        super().__init__(**kwargs)
        self.query = query
        self.database = database
        self.output_location = output_location
        self.aws_conn_id = aws_conn_id
        self.client_request_token = client_request_token or str(uuid4())
        self.workgroup = workgroup
        self.query_execution_context = query_execution_context or {}
        self.result_configuration = result_configuration or {}
        self.sleep_time = sleep_time
        self.max_tries = max_tries
        self.query_execution_id = None  
    @cached_property
    def hook(self) -> AWSAthenaHook: