Docs reference timeout_ms as being the 'time to wait for the query to complete':
https://github.com/GoogleCloudPlatform/google-cloud-python/blob/master/bigquery/google/cloud/bigquery/query.py#L386

This is contradictory to the actual use of timeout_ms as the API docs describe it as the request timeout:
https://cloud.google.com/bigquery/docs/reference/rest/v2/jobs/query#timeoutMs

TimeoutMS is distinctly NOT the time 'to wait for query to complete'. The docs should be more explicit since query vs request timeout are vastly different things.