OS_TEST_TIMEOUT counts in 'second' ?

I guess the time unit that OS_TEST_TIMEOUT is using is 'seconds', but I didn't see the official description in the document and need to confirm this. Did I miss some part of other document?

Thanks.

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-----------------------------------
Release: 3.8.1.dev1 on 2019-07-16 21:12:14
SHA: 7ad16dea566cf9c29e0a544236da85726803a5fe
Source: https://opendev.org/openstack/oslotest/src/doc/source/reference/api/oslotest.base.rst
URL: https://docs.openstack.org/oslotest/latest/reference/api/oslotest.base.html