They are green for good 15 minutes from first moment i see problems, not the first time, it happens actually quite often. Maybe that's the time they need to confirm/cross check/write status update, don't know.

Several of the recent outages were much longer (at least for us, here in Asia) than they admitted on their status page. In one case I started work, noticed I couldn't push to or pull from GitHub, that situation persisted all day, and around 5pm local time (so morning-ish in the US) suddenly their status page acknowledged the problem and a discussion started on HN.

They do intentionally or not lie about this on their status page. From December 25th to December 31st 2021, Github actions had network problems almost every single day for hours and the status page was green out through out that period.

Same thing also happened few months back.

It feels like they do this manually and it's only done when enough people are effected.