Actually, according to the status report, they confirmed that the issue affected all regions at 19:21 and resolved it by 19:27. That's six minutes of global outage.
The outage took my site down (on us-central1-c) at 19:13, according to my logs, so it was already impacting multiple regions by 19:13. (I have been using GCP since 2012 and love it.)
Thank you, I missed that on my first reading - I saw the status update was posted at 19:45, not the content within it stating the issue was resolved at 19:27. I updated my parent comment.
Disclaimer: I work for Google (not on Cloud).