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
"""
        params = {
            'QueryString': query,
            'QueryExecutionContext': query_context,
            'ResultConfiguration': result_configuration,
            'WorkGroup': workgroup,
        }
        if client_request_token:
            params['ClientRequestToken'] = client_request_token
        response = self.get_conn().start_query_execution(**params)
        query_execution_id = response['QueryExecutionId']
        return query_execution_id
    def check_query_status(self, query_execution_id: str) -> Optional[str]:
        """
        Fetch the status of submitted athena query. Returns None or one of valid query states.
        :param query_execution_id: Id of submitted athena query
        :type query_execution_id: str
        :return: str
        """
        response = self.get_conn().get_query_execution(QueryExecutionId=query_execution_id)
        state = None
        try:
            state = response['QueryExecution']['Status']['State']
        except Exception as ex:  
            self.log.error('Exception while getting query state %s', ex)
        finally:
            
            
            return state  
    def get_state_change_reason(self, query_execution_id: str) -> Optional[str]: