Can you point me to docs where it states that the default value is in seconds?

Agree <1s wouldn't be useful, but would you ever need to set 180.5 seconds. I can't think of a reason why you would need to, but sometimes people have surprising requirements. 15 seems reasonable for me.

Currently the value is set in microseconds, which I agree is a bit unusual. Also the choice of 108s is also unusual. Two questions then: 1.) Would you ever envision needing to set a token expiration for increments less than one second? 2.) What would...

"JWT token is expiring by default after 1.8 sec."Can you confirm that you are seeing tokens expire in 1.8 seconds? Later on in the post it seems to say that the tokens are expiring in 108s which is consistent with what I am seeing.