How long does the one-time use SSH public key expire?

Question

I'm interested in the recent feature   .  
  
The doc says there is a one-time use SSH public key that only remains **60** seconds.  
  
But I tried it by self, looks like the one-time SSH public key always is valid after pushing it via cli. I can still use the corresponding private key to login the instance after pushing public key more than 10 minutes.  
  
Is it expected behavior? How should I understand the one-time use SSH public key mentioned in doc?

Accepted Answer

I turned it out. EC2 instance connect works as expected to create one-time SSH public key for 60 times.   
  
The behavior I observed caused by **ssh-agent** cached another key of ec2 instance.

How long does the one-time use SSH public key expire?

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