SLA for Comprehend Async (StartEntitiesDetectionJob)?

Is there a service level for AWS Comprehend's async entities detection job? https://docs.aws.amazon.com/comprehend/latest/dg/API_StartEntitiesDetectionJob.html

E.g. "for 100 documents of 5kB each, it will maximally take 10 mins to complete". "for 1M documents of 5kB each, it will maximally take 1hr to complete", etc.

I'm leaning towards using async entities detection job, but am worried about how soon I can get my results. This would determine the batch size I use for each job.

Alternatively, I would have to do a workaround/hack by breaking my documents down and using the BatchDetectEntities API instead.. Would like to avoid this if possible. https://docs.aws.amazon.com/comprehend/latest/dg/API_BatchDetectEntities.html