git credential cache timeout questions

I have configured my git to cache my credentials for 12 hours using this section in my .gitconfig

[credential "https://mygithub.example.edu"]
    username = myuser
    helper = cache --timeout 43200

However, the credentials don’t always seem to expire after 12 hours. Sometimes I come back the next morning and the credentials still work. This is generally after leaving at 5:00 PM and coming back in the next day at 9:00 AM, well past the 12 hour timeout.

Is there any way to see the current timeout value? Is it a rolling timeout (i.e. any git action resets the timeout)?

If it happened once or twice, I would assume I just forgot that I did something with git later than I thought. But this happens frequently enough that it’s difficult to accept that as a possibility. It’s not a daily occurrence. My credentials do expire…I just have no idea when they will.

Have I setup my gitconfig section wrong?

CentOS 7. Git 2.24.3.

Thanks.

--John