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
"""
    An operator that submits a presto query to athena.
    :param query: Presto to be run on athena. (templated)
    :type query: str
    :param database: Database to select. (templated)
    :type database: str
    :param output_location: s3 path to write the query results into. (templated)
    :type output_location: str
    :param aws_conn_id: aws connection to use
    :type aws_conn_id: str
    :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 in which query will be run
    :type workgroup: str
    :param query_execution_context: Context in which query need to be run
    :type query_execution_context: dict
    :param result_configuration: Dict with path to store results in and config related to encryption
    :type result_configuration: dict
    :param sleep_time: Time to wait between two consecutive call to check query status on athena
    :type sleep_time: int
    :param max_tries: Number of times to poll for query state before function exits
    :type max_tries: int
    """
    ui_color = '#44b5e2'
    template_fields = ('query', 'database', 'output_location')
    template_ext = ('.sql',)
    @apply_defaults
    def __init__(