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
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"""
This module contains AWS Athena hook
"""
from time import sleep
from typing import Any, Dict, Optional
from botocore.paginate import PageIterator
from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook
class AWSAthenaHook(AwsBaseHook):
    """
    Interact with AWS Athena to run, poll queries and return query results
    Additional arguments (such as ``aws_conn_id``) may be specified and
    are passed down to the underlying AwsBaseHook.
    .. seealso::
        :class:`~airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook`
    :param sleep_time: Time to wait between two consecutive call to check query status on athena
    :type sleep_time: int
    """
    INTERMEDIATE_STATES = (
        'QUEUED',
        'RUNNING',
    )
    FAILURE_STATES = (
        'FAILED',
        'CANCELLED',
    )
    SUCCESS_STATES = ('SUCCEEDED',)
    def __init__(self, *args: Any, sleep_time: int = 30, **kwargs: Any) -> None: