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
"""Create and return an AWSAthenaHook."""
        return AWSAthenaHook(self.aws_conn_id, sleep_time=self.sleep_time)
    def execute(self, context: dict) -> Optional[str]: