What is the amount of time that Opswork stacks services waits for a response from an underlying instance before deeming it as a failed instance?

Answer options:

A.1 minute.
B.5 minutes.
C.20 minutes.
D.60 minutes

Answer – B
The AWS Documentation mentions
Every instance has an AWS OpsWorks Stacks agent that communicates regularly with the service. AWS OpsWorks Stacks uses that communication to monitor instance health. If an agent does not communicate with the service for more than approximately five minutes, AWS OpsWorks Stacks considers the instance to have failed.
For more information on the Auto healing feature , please visit the below URL:
http://docs.aws.amazon.com/opsworks/latest/userguide/workinginstances-autohealing.html