Resolution:
When we run AppManage it creates a Hawk Console Base (hcb) object and then uses the hcb to invoke the method on the hawkagents to start the component. The hcb internally creates a timer and waits for the instance to start. This timer is reset each time it gets a message from hawkagent that the task is still in progress and hasn't started yet. If this message or the message indicating the completion of the task is missed or gets delayed due to machine getting overwhelmed, in case it is unable to take the load due to multiple engines starting at the same time or the inbox messages are not flowing through, we might see this issue. The timer is set at 10 seconds and this is not configurable.

Workaround:
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Use smaller batches to start the applications in case the machine is getting slowed down considerably on starting multiple engines at once.

I am getting timeouts when starting multiple engines at once using AppManage in batch mode: COM.TIBCO.hawk.talon.MicroAgentException: Request timed out